BIOL 303 Lecture 9: Study Questions for Lecture 9 Study question answers to lecture 9.
16 Oct 2011
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List and briefly explain 2 female and two male sex chromosome abnormalities: what is the difference between mammalian and bird sex determination? (what is the similarity?) In mammals the presence of the second x or y chromosome determines whether it is a male or female. Turner syndrome: when a female only inherts one x chromosome, the genotype is xo. Metafemales: are females that inherit an extra x chromosome. They are fertile, tall, and possibly slight mental retardation. Klinefelter syndrome: where males inherit extra x chromosomes, their genotypes are xxy, xxxy. They are tall, mostly sterile, and have body feminization. Xyy syndrome: males inherit an extra y chromosome, their genotype is xyy. They have high testosterone, are tall, fertile, and have acne in puberty: define primary and secondary sex determination in mammals. This is when sex determination is based on chromosome and no environment component.
