The secondary sex ratio of newborns in the United States is 105 males:100 females. Why doesn't this match the 1:1 predicted primary sex ratio?
A) because males and females have different survival rates between conception and birth
B) because there are often errors in chromosomal segregation at meiosis I
C) because defects in essential sex-determining hormones change the sex of zygotes after fertilization
D) because there is sometimes spontaneous chromosome duplication of the X or Y after development begins
Correct Answer:
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Q11: Which of the following events occur during
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