Multiple Choice
Which of the following statements about the nuclei in most cells of a typical mushroom (the fruiting body of a basidiomycete fungus) is correct?
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2. Mendel's Laws of Inheritance
Sex-Linked Genes
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Which allele combination represents a female who is heterozygous for a sex-linked trait?
A
X^A X^a
B
X^A X^A
C
X^A Y
D
X^a Y
Verified step by step guidance1
Understand that sex-linked traits are typically located on the X chromosome, and females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
Recognize that being heterozygous means having two different alleles for a particular gene. For a sex-linked trait on the X chromosome, this means the female has one dominant allele and one recessive allele on her two X chromosomes.
Identify the notation: $X^A$ represents the X chromosome with the dominant allele, and $X^a$ represents the X chromosome with the recessive allele.
Since the question asks for a female heterozygous for the trait, look for the combination with two X chromosomes carrying different alleles: $X^A X^a$.
Confirm that other options either represent homozygous females ($X^A X^A$), males with dominant allele ($X^A Y$), or males with recessive allele ($X^a Y$), which do not fit the criteria of a heterozygous female.
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