







Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
Sex-Linked Traits. ○ Some genetic information for non-gender traits are found on the. X chromosome. ○ For males, X chromosome comes from their mother.
Typology: Lecture notes
1 / 13
This page cannot be seen from the preview
Don't miss anything!
● Most traits and disorders are found on autosomes ○ autosome- a body chromosome (44 in humans) ● Some disorders are caused by recessive alleles ○ homozygous recessive (dd) = recessive disorder ○ homozygous dominant (DD) = healthy ○ heterozygous (Dd) = healthy, but carrier ● ex) cystic fibrosis, sickle-cell anemia
● Our cells have 2 sex chromosomes ○ X- contains gender info and some autosomal traits ○ Y- contains only gender info ● XX = female ● XY = male ● Each parent donates one sex chromosome to offspring
● Some genetic information for non-gender traits are found on the X chromosome ○ For males, X chromosome comes from their mother ■ all body traits on the X are automatically shown, even recessive ○ For females, one X comes from mom and another from dad ■ standard hereditary rules apply ● ex) color blindness, male pattern baldness, hemophilia
● If X B^ = allele for normal vision, and X b^ = allele for colorblindness, what are the possible phenotypes for a woman homozygous for normal vision and a man with normal vision? ● dad = X BY ● mom = X BX B
● Genotypes- 1 XB^ XB^ : 1 XB^ Y ● Phenotypes- 1 normal female : 1 normal male
● If X B^ = allele for normal vision, and X b^ = allele for colorblindness, what are the possible phenotypes for a woman heterozygous for normal vision and a man with color blindness? ● dad = X bY ● mom = X BX b
X B^ X b^ X BY
X b^ X b^ X bY
X b^ Y X B
X b
● Genotypes- 1 XB^ Xb^ : 1 XB^ Y :1 X b^ Xb^ : 1 Xb^ Y ● Phenotypes- 1 carrier female : 1 normal male : color blind female : 1 color blind male
● In some cats, hair color is found on the X chromosome ○ Orange and black hair are codominant traits ● Calico cats have orange, black, and white hair ○ Females have an orange allele on one X, and a black allele on the other X ■ show up as patches due to X-gene inactivation ○ Since males only have one X, they cannot be calico ■ exception- a cat with XXY
● If X O= orange fur, and X B^ = black fur, what would be the possible phenotypes between a calico female and black male cat? ● male= X BY ● female= X OX B
● Phenotypes- 1 calico female: 1 black female: 1 orange male: 1 black male