BIOLOGY 1A03 Lecture Notes - Lecture 5: Dystrophin, Meiosis, Homologous Chromosome
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26 Mar 2018
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BIOLOGY 1A03 Full Course Notes
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Unit 5 module 3 sex chromosomes and linkage. Unit 1: the inheritance of genes on the x chromosome. The chromosomal basis for determining sex is rather unique. In humans and other mammals, there are two types of sex chromosomes- the x and y chromosome, with the y chromosome being much smaller than the x chromosome. A female will carry two x chromosomes a male will develop from a gamete that carries both an x and y chromosome. Most of the regions on the x and y chromosomes are largely nonhomologous, meaning almost none of the genes in the x chromosome have counterparts in the y chromosome, recombination between these two chromosomes will not occur. Sequencing of the human y chromosome has revealed that there are 78 genes on this chromosome that code for about 25 proteins (and half of these genes help determine sex).
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