BIOL 303 Lecture Notes - Lecture 15: Hypertrichosis, Haemophilia B, Haemophilia
2 Mar 2017
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Document Summary
The proportion of males to females in a human population: Calculated by # of males/ # of females multiplied by 1,000. Sex ratios can change markedly with age: Estrogen for females are more than in males. When female go through menopause w/ thousands of eggs. Menopause cause cholesterols to go up when menopause hits in for females. Males die a lot more frequently than with women. Genes on the y chromosome are said to be y-linked. A female does not have a y chromosome. Currently, identified y-linked traits involve infertility and are not transmitted. If sperm doesn"t develop properly, transmitting won"t happen. Patterns of expression on the x chromosome differ in females and males. Females: x-linked traits are passed like autosomal traits. Males: a single copy of an x-linked allele causes expression of the trait or illness. Human male is considered hemizygous for x-linked traits. Males are more likely to suffer from genetic disease than females because of all the.
