In mammals, the usual chromosomal sex determination system is:
Correct answer: A. Male XY and female XX
- A. Male XY and female XX
- B. Male ZZ and female ZW
- C. Male XX and female XY
- D. Male XO and female XX
Explanation
Most mammals have XX females and XY males. The presence of the Y chromosome, particularly the SRY region, usually initiates male development. The ZZ and ZW system is typical of many birds.
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