Question

A man who is a dwarf with achondroplasia and normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Dwarfism caused by achondroplasia is autosomal dominant, and red-green color blindness is X-linked recessive. How many of their daughters might be expected to be colorblind with achondroplasia? (A) none (B) half (C) one out of four (D) three out of four

Answer 1

Correct option A) None.

The male dwarf's father was of normal height; that is, homozygous recessive for achondroplasia. Consequently, the dwarf man of this exercise was heterozygous for the character (say Aa) because this condition is autosomal dominant.

He also has normal vision reason why he is X-NY and  X-N which represents the X chromosome with the dominant N allele for normal vision. The woman is color blind and hence a homozygous recessive X-nX-n and of normal height.

Autosomal dominant helps  to alleles harbored by any chromosome other than the sexual pair that show complete dominance over the recessive ones. Other diseases such as Huntington's disease, are autosomal dominant.

To learn more about homozygous recessive here

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