Multiple Choice
Which sex chromosome is longer and is present in two copies in normal females but only one copy in normal males?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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Which sex chromosomes do not usually undergo genetic recombination during meiosis?
A
X chromosomes
B
Y chromosomes
C
Autosomes
D
Both X and Y chromosomes
Verified step by step guidance1
Understand that genetic recombination (crossing over) typically occurs between homologous chromosomes during meiosis, which helps increase genetic diversity.
Recall that in humans, females have two X chromosomes (XX), which are homologous and can undergo recombination during meiosis.
Recognize that males have one X and one Y chromosome (XY), which are not fully homologous except for small regions called pseudoautosomal regions.
Note that the Y chromosome largely does not recombine with the X chromosome during meiosis because most of its length is unique and does not have a homologous partner.
Conclude that the sex chromosome that usually does not undergo genetic recombination during meiosis is the Y chromosome.
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