Multiple Choice
Which of the following statements is true of a species that has a chromosome number of 2n = 16?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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Which parent determines the biological sex of a baby?
A
Both parents equally, because both contribute either an X or a Y chromosome
B
Neither parent; the sex is determined randomly after fertilization
C
The father, because he can contribute either an X or a Y chromosome
D
The mother, because she can contribute either an X or a Y chromosome
Verified step by step guidance1
Understand that biological sex in humans is determined by the combination of sex chromosomes inherited from the parents.
Recall that females have two X chromosomes (XX), so the mother can only contribute an X chromosome to the offspring.
Recall that males have one X and one Y chromosome (XY), so the father can contribute either an X or a Y chromosome.
Recognize that if the father contributes an X chromosome, the offspring will be genetically female (XX), and if the father contributes a Y chromosome, the offspring will be genetically male (XY).
Conclude that the father determines the biological sex of the baby because he provides either the X or Y chromosome, while the mother always provides an X chromosome.
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