Multiple Choice
Which sex chromosomes do not usually undergo genetic recombination during meiosis?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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If a particular gene is located on the Z chromosome in a species with ZW sex determination (such as birds), which of the following statements is correct?
A
Both males and females have the same number of copies of the gene.
B
Females (ZW) have two copies of the gene, while males (ZZ) have only one copy.
C
Males (ZZ) have two copies of the gene, while females (ZW) have only one copy.
D
The gene is only expressed in females.
Verified step by step guidance1
Understand the ZW sex determination system: In species with ZW sex determination, females have ZW chromosomes and males have ZZ chromosomes.
Identify the location of the gene: The gene is located on the Z chromosome, which means it is present on the Z chromosome(s) but not on the W chromosome.
Determine the number of gene copies in males: Since males are ZZ, they have two Z chromosomes, so they have two copies of the gene.
Determine the number of gene copies in females: Since females are ZW, they have only one Z chromosome, so they have only one copy of the gene.
Conclude which statement is correct based on the above: Males (ZZ) have two copies of the gene, while females (ZW) have only one copy.
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