BIOA01H3 Lecture Notes - Lecture 31: Thomas Hunt Morgan, Vulgate, Eye Color

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Maydianne Andrade

Document Summary

Abnormal disorder-causing allele is recessive and is located on the x-chromosome. More males than females show the disorder https://onedrive. live. com/edit. aspx/documents/biology?cid=4612573e81e7633b&id=documents&wd=target%281. 1%20november. one%7c4f32b2c4-4822-46 1/17. Sons --> none are affected, nor will they transmit the condition to their offspring. Daughters --> none are affected, but all are carriers; half of their sons are affected (and half of their daughters are carriers. Red-green colourblindnes, hemophilia, duchenne muscular dystrophy, testicular feminization syndrome. Eye colour phenotypes in drosphila: normal, red wild-type eye colour. Fruit flies have red eyes, normally: mutant white eye colour caused by a recessive allele of a sex-linked gene carried on the x chromosome https://onedrive. live. com/edit. aspx/documents/biology?cid=4612573e81e7633b&id=documents&wd=target%281. 1%20november. one%7c4f32b2c4-4822-46 2/17. W mutation (white eyed mutation) in the x-chromosome. The gene white (w) is on the x-chromosome. The normal allele + at this locus gives red eyes https://onedrive. live. com/edit. aspx/documents/biology?cid=4612573e81e7633b&id=documents&wd=target%281. 1%20november. one%7c4f32b2c4-4822-46 3/17. Reciprocal cross: flies: true-breeding red-eyed female x white-eyed male. Female flies produce only xw+ (pure breeding wild type, homozygous dominant) haploid gametes.