Scelta multipla
Which of the following karyotypes represents the addition of normal male (XY) cat DNA?
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3. Extensions to Mendelian Inheritance
Sex Chromosome
Scelta multipla
In humans, if a male child named Calix has an X chromosome that matches one of his parents, which parent did he inherit his X chromosome from?
A
Both parents equally
B
His mother
C
His father
D
Neither parent
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Recall that human males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).
Understand that males inherit their Y chromosome from their father and their X chromosome from their mother.
Since Calix is male, his single X chromosome must have come from his mother, because the father contributes the Y chromosome to male offspring.
Therefore, the X chromosome in a male child cannot come from the father, only from the mother.
Conclude that Calix inherited his X chromosome from his mother.
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