Multiple Choice
In a human karyotype, there are 22 pairs of autosomes and 1 pair of which type of chromosomes?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which sex chromosome is longer and is present in two copies in normal females but only one copy in normal males?
A
X chromosome
B
Y chromosome
C
Mitochondrial chromosome
D
Autosome
Verified step by step guidance1
Understand the basic difference between sex chromosomes and autosomes: Sex chromosomes determine the biological sex of an individual, while autosomes are all other chromosomes that do not determine sex.
Recall that humans have two types of sex chromosomes: X and Y. Females typically have two X chromosomes (XX), and males have one X and one Y chromosome (XY).
Identify which sex chromosome is longer: The X chromosome is significantly larger than the Y chromosome in terms of both size and gene content.
Recognize the copy number difference between males and females: Normal females have two copies of the X chromosome, while normal males have only one copy of the X chromosome and one Y chromosome.
Conclude that the chromosome described as longer and present in two copies in females but only one in males is the X chromosome.
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