KINE 2011 Lecture Notes - Lecture 11: Prophase, Sister Chromatids, Zygosity
24 Oct 2017
School
Department
Course
Professor
Document Summary
In mammals, genetic sex is determined by chromosomes carried by sperm: all female eggs are xx- considered homogametic. Homogametic means you produce one type of gamete with respect to that sex chromosome. All female egg gametes are x: all male sperms are xy- considered heterogametic. Male could produce sperms that either x or y: males are referred to as hemizygous for x-linked genes. Different species have different modes of sex determination: xy system is when males are heterogametic (humans) Males are hemizygous for y-linked genes: zw system where females are heterogametic female carries 2 different sex chromosomes. Females are hemizygous for z-linked genes: some species have the same chromosomes in both sexes. Sex is determined based on environment: diploid/haploid, temperature. Gender sex vs gender: genetic sex is based on biological conditions gene, organs, gender is personal & dependent on social constructs. Clicker q: an xy embryo may develop as a phenotypic female if:
