Multiple Choice
Which of the following syndromes is NOT correctly paired with its causative chromosomal aberration?
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2. Mendel's Laws of Inheritance
Sex-Linked Genes
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In cats, the gene for fur color is located on the X chromosome, with the allele for black fur (B) and the allele for orange fur (O) being codominant. Which of the following fur colors are possible in male cats?
A
Black
B
Orange
C
Gray
D
Calico (black, orange, and white patches)
Verified step by step guidance1
Understand that male cats have one X chromosome and one Y chromosome (XY), so they have only one allele for fur color on the X chromosome.
Since the gene for fur color is on the X chromosome, a male cat can only have one allele for fur color, either B (black) or O (orange), but not both.
Recognize that codominance means that if both alleles are present (as in females with two X chromosomes), both colors can be expressed, resulting in calico fur.
Since males have only one X chromosome, they cannot be calico because they cannot have both B and O alleles simultaneously.
Therefore, the possible fur colors in male cats are those corresponding to a single allele: either black (B) or orange (O), but not gray or calico.
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