A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Most sex - linked genes in male heterogametic animals are present on the X- chromosome. Some animals, however, may carry a few genes on the Y chromosome that produce visible effects on the phenotype of the organism. Y linkage is very rare in higher animal, particularly mammals. X linkage, on the other hand, is very common in all mammals that have been studied, the mammalian X chromosome contains a larger number of genes with major effects on phenotype.
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