Download
slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
All great apes except Homo sapiens have 24 pairs of chromosomes PowerPoint Presentation
Download Presentation
All great apes except Homo sapiens have 24 pairs of chromosomes

All great apes except Homo sapiens have 24 pairs of chromosomes

187 Vues Download Presentation
Télécharger la présentation

All great apes except Homo sapiens have 24 pairs of chromosomes

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. All great apes except Homo sapiens have 24 pairs of chromosomes

  2. Why do humans only have 23? What happened to the other chromosome?

  3. Chimp Chr 2q Human chromosome 2 is a fusion of the ancestral Chromosomes 2p and 2q Human Chr 2 Chimp Chr 2p

  4. centromere centromere centromere remnant centromere Human Chimp

  5. telomere DNA remnants telomere DNA Human Chimp

  6. How common are chromosomal fusions? • In humans, about 1 in 1,000 are born with one copy of Chr 13 stuck to a copy of Chr 14 • Fusions can spread in a population if there • are no “costs” • Usually, there are problems in reproduction • (meiosis)

  7. Asian musk shrew (Suncus murinus) Some individuals have 5 fewer chromosomes than others because of fusions – with no detrimental effects