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In the context of human sex chromosomes, why is the human female described as homogametic?
AShe produces gametes of two different chromosome types
BShe has one X and one Y chromosome
CShe produces only X-bearing gametes of one type
DShe produces only Y-bearing gametes
Answer & Solution
Correct answer: C. She produces only X-bearing gametes of one type
1. A female has two X chromosomes (XX).
2. Every egg she forms carries the same sex chromosome, X.
3. Producing gametes of only one type is called homogametic.
4. Producing two types of gametes (X and Y) is heterogametic, which describes the male and rules out option A.
5. So the female is homogametic because all her eggs are X-bearing, option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Sex Determination in Human", p.276_
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