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Slides 03 ChromosomeTheroy Genetics.pdf
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00:02 Sex determination in humans, you are probably all fairly familiar with the female has a possibility of contributing X and X and the male could contribute and X or a Y. And the Y chromosome is a little bit special. First of all, it is tiny, but it also has a gene on it that is involved in sex determination. It is called the SRY region of the Y chromosomes. 00:28 It is the sex-determining region of the Y chromosome. And if that gene is present and expressed, then we will see maleness, but if that gene is not present maybe there is no Y chromosome or maybe the gene is broken, then by default we will see the female phenotype in human condition. We know how this works out. We have an X and a Y. We can have male progeny or X is in excess, we have female progeny. Fifty percent chance of boys or girls based on this sex determining system.
About the Lecture
The lecture Sex Chromosomes – Chromosome Theory and Sex Linkage by Georgina Cornwall, PhD is from the course Understanding Genetics.
Included Quiz Questions
Which of the following is NOT true regarding human sex chromosomes and inheritance/development of gender?
- The SRY region of the Y chromosome promotes the development of female genitalia.
- Human female cells contain XX sex chromosomes in their nucleus, whereas human males have XY sex chromosomes.
- If the SRY gene is present and expressed, the male phenotype will develop.
- Fathers can pass on X and Y chromosomes to their progeny.
- Mothers can pass on X chromosomes to their progeny.
Author of lecture Sex Chromosomes – Chromosome Theory and Sex Linkage
Georgina Cornwall, PhD
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