Dnaftb.org - SEO Checker

Overview of the SEO Check
Meta information
53% 
Page quality
47% 
Page structure
79% 
Link structure
100% 
Server
40% 
External factors
100% 
SEO Score
Response time
0.50 s
File size
15.40 kB
Words
411
Media files
50
Number of links
49 internal / 7 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
DNA from the Beginning - An animated primer of 75 experiments that made modern genetics.
The page title should be shorter than 580 pixels. It is 830 pixels long. Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
Discover the concepts and experiments that define the fields of genetics and molecular biology. This animated primer features the work of over 100 scientists and researchers.
The meta description is too long: 1072 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Server location: United States of America
The language is not specified in the HTML markup.
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype XHTML 1.0 Transitional is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
No favicon is linked in the HTML code.

Meta tags

NameValue
descriptionDiscover the concepts and experiments that define the fields of genetics and molecular biology. This animated primer features the work of over 100 scientists and researchers.
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
Some words from the page title are not used within the pages content
Only 2 paragraph/s was/were found on this page.
There are only 411 words on this page. Good pages should have about 800 words of useful content.
33.3% of the text are stop words.
The page contains a listing, which indicates a good text layout.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 13.86 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 8 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
/images/general/search_icon.jpgSearch
/images/general/home-logo.jpgDNA from the Beginning
/images/thumbnails/1-thumb-sm.png1. Children resemble their parents.
/images/thumbnails/2-thumb-sm.png2. Genes come in pairs.
/images/thumbnails/3-thumb-sm.png3. Genes don't blend.
/images/thumbnails/4-thumb-sm.png4. Some genes are dominant.
/images/thumbnails/5-thumb-sm.png5. Genetic inheritance follows rules.
/images/thumbnails/6-thumb-sm.png6. Genes are real things.
/images/thumbnails/7-thumb-sm.png7. All cells arise from pre-existing cells.
/images/thumbnails/8-thumb-sm.png8. Sex cells have one set of chromosomes; body cells have two.
/images/thumbnails/9-thumb-sm.png9. Specialized chromosomes determine sex.
/images/thumbnails/10-thumb-sm.png10. Chromosomes carry genes.
/images/thumbnails/11-thumb-sm.png11. Genes get shuffled when chromosomes exchange pieces.
/images/thumbnails/12-thumb-sm.png12. Evolution begins with the inheritance of gene variations.
/images/thumbnails/13-thumb-sm.png13. Mendelian laws apply to human beings.
/images/thumbnails/14-thumb-sm.png14. Mendelian genetics cannot fully explain human health and behavior.
/images/thumbnails/section1-graph.jpgClassical Genetics
/images/thumbnails/15-thumb-sm.png15. DNA and proteins are key molecules of the cell nucleus.
/images/thumbnails/16-thumb-sm.png16. One gene makes one protein.
/images/thumbnails/17-thumb-sm.png17. A gene is made of DNA.
/images/thumbnails/18-thumb-sm.png18. Bacteria and viruses have DNA too.
/images/thumbnails/19-thumb-sm.png19. The DNA molecule is shaped like a twisted ladder.
/images/thumbnails/20-thumb-sm.png20. A half DNA ladder is a template for copying the whole.
/images/thumbnails/21-thumb-sm.png21. RNA is an intermediary between DNA and protein.
/images/thumbnails/22-thumb-sm.png22. DNA words are three letters long.
/images/thumbnails/23-thumb-sm.png23. A gene is a discrete sequence of DNA nucleotides.
/images/thumbnails/24-thumb-sm.png24. The RNA message is sometimes edited.
/images/thumbnails/25-thumb-sm.png25. Some viruses store genetic information in RNA.
/images/thumbnails/26-thumb-sm.png26. RNA was the first genetic molecule.
/images/thumbnails/27-thumb-sm.png27. Mutations are changes in genetic information.
/images/thumbnails/28-thumb-sm.png28. Some types of mutations are automatically repaired.
/images/thumbnails/section2_graph.jpgMOLECULES OF GENETICS
/images/thumbnails/29-thumb-sm.png29. DNA is packaged in a chromosome.
/images/thumbnails/30-thumb-sm.png30. Higher cells incorporate an ancient chromosome.
/images/thumbnails/31-thumb-sm.png31. Some DNA does not encode protein.
/images/thumbnails/32-thumb-sm.png32. Some DNA can jump.
/images/thumbnails/33-thumb-sm.png33. Genes can be turned on and off.
/images/thumbnails/34-thumb-sm.png34. Genes can be moved between species.
/images/thumbnails/35-thumb-sm.png35. DNA responds to signals from outside the cell.
/images/thumbnails/36-thumb-sm.png36. Different genes are active in different kinds of cells.
/images/thumbnails/37-thumb-sm.png37. Master genes control basic body plans.
/images/thumbnails/38-thumb-sm.png38. Development balances cell growth and death.
/images/thumbnails/39-thumb-sm.png39. A genome is an entire set of genes.
/images/thumbnails/40-thumb-sm.png40. Living things share common genes.
/images/thumbnails/41-thumb-sm.png41. DNA is only the beginning for understanding the human genome.
/images/thumbnails/section3_graph.jpgGENETIC ORGANIZATION AND CONTROL
/images/general/icon/Instagram.pngInstagram icon
/images/general/icon/facebook.pngFacebook icon
/images/general/icon/twitter.pngTwitter icon
/images/general/icon/youtube.pngDNA Learning Center's YouTube Channel

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H3 DNA from the Beginning is organized around key concepts.
H4 The science behind each concept is explained by: animation, image gallery, video interviews, problem, biographies, and links.
The number of internal links is ok.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 7 external links on this page.
LinkAttributesAnchor text
https://dnaftb.org/1/Children resemble their parents.
IMG-ALT 1. Children resemble their parents.
https://dnaftb.org/2/Genes come in pairs.
IMG-ALT 2. Genes come in pairs.
https://dnaftb.org/3/Genes don't blend.
IMG-ALT 3. Genes don't blend.
https://dnaftb.org/4/Some genes are dominant.
IMG-ALT 4. Some genes are dominant.
https://dnaftb.org/5/Genetic inheritance follows rules.
IMG-ALT 5. Genetic inheritance follows rules.
https://dnaftb.org/6/Genes are real things.
IMG-ALT 6. Genes are real things.
https://dnaftb.org/7/All cells arise from pre-existing cells.
IMG-ALT 7. All cells arise from pre-existing cells.
https://dnaftb.org/8/Sex cells have one set of chromosomes; body cells have two.
IMG-ALT 8. Sex cells have one set of chromosomes; body cells have two.
https://dnaftb.org/9/Specialized chromosomes determine sex.
IMG-ALT 9. Specialized chromosomes determine sex.
https://dnaftb.org/10/Chromosomes carry genes.
IMG-ALT 10. Chromosomes carry genes.
https://dnaftb.org/11/Genes get shuffled when chromosomes exchange pieces.
IMG-ALT 11. Genes get shuffled when chromosomes exchange pieces.
https://dnaftb.org/12/Evolution begins with the inheritance of gene variations.
IMG-ALT 12. Evolution begins with the inheritance of gene variations.
https://dnaftb.org/13/Mendelian laws apply to human beings.
IMG-ALT 13. Mendelian laws apply to human beings.
https://dnaftb.org/14/Mendelian genetics cannot fully explain human health and behavior.
IMG-ALT 14. Mendelian genetics cannot fully explain human health and behavior.
https://dnaftb.org/15/DNA and proteins are key molecules of the cell nucleus.
IMG-ALT 15. DNA and proteins are key molecules of the cell nucleus.
https://dnaftb.org/16/One gene makes one protein.
IMG-ALT 16. One gene makes one protein.
https://dnaftb.org/17/A gene is made of DNA.
IMG-ALT 17. A gene is made of DNA.
https://dnaftb.org/18/Bacteria and viruses have DNA too.
IMG-ALT 18. Bacteria and viruses have DNA too.
https://dnaftb.org/19/The DNA molecule is shaped like a twisted ladder.
IMG-ALT 19. The DNA molecule is shaped like a twisted ladder.
https://dnaftb.org/20/A half DNA ladder is a template for copying the whole.
IMG-ALT 20. A half DNA ladder is a template for copying the whole.
https://dnaftb.org/21/RNA is an intermediary between DNA and protein.
IMG-ALT 21. RNA is an intermediary between DNA and protein.
https://dnaftb.org/22/DNA words are three letters long.
IMG-ALT 22. DNA words are three letters long.
https://dnaftb.org/23/A gene is a discrete sequence of DNA nucleotides.
IMG-ALT 23. A gene is a discrete sequence of DNA nucleotides.
https://dnaftb.org/24/The RNA message is sometimes edited.
IMG-ALT 24. The RNA message is sometimes edited.
https://dnaftb.org/25/Some viruses store genetic information in RNA.
IMG-ALT 25. Some viruses store genetic information in RNA.
https://dnaftb.org/26/RNA was the first genetic molecule.
IMG-ALT 26. RNA was the first genetic molecule.
https://dnaftb.org/27/Mutations are changes in genetic information.
IMG-ALT 27. Mutations are changes in genetic information.
https://dnaftb.org/28/Some types of mutations are automatically repaired.
IMG-ALT 28. Some types of mutations are automatically repaired.
https://dnaftb.org/29/DNA is packaged in a chromosome.
IMG-ALT 29. DNA is packaged in a chromosome.
https://dnaftb.org/30/Higher cells incorporate an ancient chromosome.
IMG-ALT 30. Higher cells incorporate an ancient chromosome.
https://dnaftb.org/31/Some DNA does not encode protein.
IMG-ALT 31. Some DNA does not encode protein.
https://dnaftb.org/32/Some DNA can jump.
IMG-ALT 32. Some DNA can jump.
https://dnaftb.org/33/Genes can be turned on and off.
IMG-ALT 33. Genes can be turned on and off.
https://dnaftb.org/34/Genes can be moved between species.
IMG-ALT 34. Genes can be moved between species.
https://dnaftb.org/35/DNA responds to signals from outside the cell.
IMG-ALT 35. DNA responds to signals from outside the cell.
https://dnaftb.org/36/Different genes are active in different kinds of cells.
IMG-ALT 36. Different genes are active in different kinds of cells.
https://dnaftb.org/37/Master genes control basic body plans.
IMG-ALT 37. Master genes control basic body plans.
https://dnaftb.org/38/Development balances cell growth and death.
IMG-ALT 38. Development balances cell growth and death.
https://dnaftb.org/39/A genome is an entire set of genes.
IMG-ALT 39. A genome is an entire set of genes.
https://dnaftb.org/40/Living things share common genes.
IMG-ALT 40. Living things share common genes.
https://dnaftb.org/41/DNA is only the beginning for understanding the human genome.
IMG-ALT 41. DNA is only the beginning for understanding the human genome.
https://dnalc.cshl.edu/External Subdomain Learn more >>
https://www.instagram.com/dna_...External Subdomain IMG-ALT Instagram icon
https://www.facebook.com/cshld...External Subdomain IMG-ALT Facebook icon
https://twitter.com/DNALCExternal IMG-ALT Twitter icon
https://www.youtube.com/user/D...External Subdomain IMG-ALT DNA Learning Center's YouTube Channel
https://dnaftb.org/Home
https://dnaftb.org/sitemap.htmlSite Map
/scientists.htmlScientists
https://dnaftb.org/glossary.htmlGlossary
https://dnaftb.org/language.htmlLanguage options
https://dnaftb.org/feedback.htmlFeedback
https://dnaftb.org/awards.htmlAwards
https://dnaftb.org/credits.htmlCredits
http://macyfoundation.org/External The Josiah Macy, Jr. Foundation
http://www.cshl.edu/External Subdomain Cold Spring Harbor Laboratory

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://dnaftb.org/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.50 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
The file size of the HTML document is fine (15 kB).

HTTP Response Header

NameValue
servernginx
dateSun, 03 Aug 2025 13:13:58 GMT
content-typetext/html; charset=utf-8
set-cookie88 Characters
content-security-policyframe-ancestors 'self' www.medecine.unige.ch;
access-control-allow-origin*
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 119 referring domains.
This page has 238 backlinks.
This page has backlinks from 76 different ip addresses.

Search preview

dnaftb.org
DNA from the Beginning - An animated primer of 75 experiments that ...
Discover the concepts and experiments that define the fields of genetics and molecular biology. This animated primer features the work of over 100 scientists and researchers.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
DNA63%Check
GENETICS58%Check
beginning52%Check
concepts50%Check
made47%Check
biology46%Check
Scientists46%Check
Genetics Education46%Check
DNA Learning Center45%Check
key40%Check

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