Genet+Chapters+5+and+6

Genet+Chapters+5+and+6 - Ch. 5 Opening: In 1910, T. H....

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Ch. 5 Opening: In 1910, T. H. Morgan discovered a white-eyed mutation with unusual “sex-linked” inheritance
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
T.H. Morgan, Drosophila , and Sex- linkage T.H. Morgan started genetic studies with fruit flies ( Drosophila melanogaster ), 1909- 1930s. Made many discoveries, but the first was discovery of sex-linkage. Sex linkage of white-eyed mutant ( w ) was important proof that genes were on chromosomes.
Background image of page 2
Fig. 5.2 Human Sex Chromosomes Differ in size and morphology Terminal regions similar, but few genes in common. Y has few genes, X many genes X and Y pair and disjoin in meiosis as if they were homologous chromosomes
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
More on sex chromosomes Many organisms have sex chromosomes like X and Y. Chromosomes other than sex chr.= autosomes . XY males are said to be hemizygous , have only one copy of X chr. genes. XY males always show phenotype of recessive alleles of X chr. genes.
Background image of page 4
Morgan’s observation: Crossed red-eyed female to white-eyed male. F1 all red eyes. F2 all females red eyes, males 1/2 red and 1/2 white.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Morgan’s hypothesis diagramed w is on X chr. There is no
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/30/2008 for the course BIOL 2156 taught by Professor Larkin during the Spring '08 term at LSU.

Page1 / 38

Genet+Chapters+5+and+6 - Ch. 5 Opening: In 1910, T. H....

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online