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4.Principles of Inheritance and Variation
normal
The recessive genes located on $X$-chromosome in humans are always
A
Lethal
B
Sub-lethal
C
Expressed in males
D
Expressed in females
Solution
The recessive genes located on $X$-chromosome in humans are always expressed in males because a female may be homozygous or heterozygous, while male is always hemizygous ($i.e.,$ only one allele is present).
Standard 12
Biology