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4.Principles of Inheritance and Variation
medium
A man receives his $X$ chromosomes from
A
His mother only
B
His father only
C
Both his mother and father
D
Either his mother or his father
Solution
(a)Human male has two sex chromosomes $X$ and $Y$. $Y$ chromosome is contributed by his father that determines the masculanity, the rest $X$ chromosome is donated by his mother only.
Standard 12
Biology
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