Inheritance Related to Sex

Inheritance Related to Sex - Inheritance Related to Sex I...

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Inheritance Related to Sex I. Sex linkage A. White eyes in Drosophila sex linked ( on the male side) B. Determination of sex - Single gene mm=female Mm=male mm x Mm ½ mm females, ½ Mm males -Honey bees- female=diploid; males= haploid (mitosis instead of meiosis) b/c of parthenogen -XY Chromosomal- identified by Bridges - It was quickly found that many other insects and other animals have a similar condition - XY chromosomal: XX (homogametic) are females and XY (heterogametic) are males XX x XY ½ XX-females ½ XY-males - Genes located on the X chromosome will have an altered pattern of inheritance because males have only one X chromosome. So, they have only 1 copy of any gene on that chromosome (hemizygous). This is the reason for the pattern of white eyes in flies. NOTE: males get their X chromosome from their mother - there are some traits in humans that are linked to the X chromosome - Pedigrees for Sex-linked recessive traits show two characteristics.
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This note was uploaded on 04/09/2008 for the course BIO 2306 taught by Professor Durhkopf during the Spring '08 term at Baylor.

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Inheritance Related to Sex - Inheritance Related to Sex I...

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