Scelta multipla
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
Scelta multipla
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
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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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