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Evolution of Sex Determination in Mammals (Sex Determination…
Evolution of Sex Determination in Mammals
Sex Determination
Developmental stage at temperature-dependent.
Sex Chromosomes
Genes
Morphologic, Physical and etological characteristics.
Y
Small and consists of heterochromatin
Account for aprox. 2 % of the haploid set in humans
X and Y chromosomes
Males (XY)- Retain of the Y chromosome
Female (XX)- lack of the Y chromosome
X
Conserved in size and gene content in different species
Account for aprox. 5 % of the haploid genome in humans
Gonads
X
formation of the pouch in female or a scrotum in male
Y
determine sex
Sexual Reproduction
Recombination
Genetic Diversity