Slide 1X-inactivation 20/11/08 Slide 2 Males are haploid for X-linked genes expression Slide 3 Barr body discovered (1949) Slide 4 Lost twin? Slide 5 Lyonization=X-inactivation…

Slide 1Lab # 11 : Sex chromatin bodies Barr body Slide 2 OrganismNo. chromosomes Human46 Human46 Chimpanzee48 Chimpanzee48 Dog78 Dog78 Horse64 Horse64 Chicken78 Chicken78…

Slide 1 Sex chromatin bodies Barr body Slide 2 OrganismNo. chromosomes Human46 Human46 Chimpanzee48 Chimpanzee48 Dog78 Dog78 Horse64 Horse64 Chicken78 Chicken78 Goldfish94…

Slide 1 X-inactivation Slide 2 Males are haploid for X-linked genes Slide 3 Barr body discovered (1949) Slide 4 Lost twin? Slide 5 Lyonization=X-inactivation The hypothesis:…

Sex chromatin bodies Barr body Organism No. chromosomes Human 46 Chimpanzee 48 Dog 78 Horse 64 Chicken 78 Goldfish 94 Fruit fly 8 Mosquito 6 Nematode 11(m), 12(f) Horsetail…

Lab # 11 : Sex chromatin bodies Barr body Organism No. chromosomes Human 46 Chimpanzee 48 Dog 78 Horse 64 Chicken 78 Goldfish 94 Fruit fly 8 Mosquito 6 Nematode 11(m), 12(f)…

X-inactivation Males are haploid for X-linked genes Barr body discovered (1949) Lost twin? Lyonization=X-inactivation The hypothesis: The heteropyknotic (..”condensed”)…