A) lethal
B) sub-lethal
C) expressed in males
D) expressed in females
Correct Answer: C
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 (ie, only one allele is present). As Haemophilia, colourblindness are some human diseases which are frequently found in males.
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