In: Biology
In humans, the inheritance of ..........is best
explained as being polygenic.
a. sickle-cell disease
b. cystic fibrosis
c. height
d. blood type
In humans, the inheritance of Height is best explained as being Polygenic.
Polygenic = poly = many; genic = genes. It is the kind of inheritance in which more than 2 genes are involved in inheriting of a character. Example = in humans, skin color, heights, etc are polygenic traits. As we do not see one or 2 kinds of heights but a variety of heights of humans and same with skin color.
So, answer to question is Option C, Height.
Sickle cell anemia ---- it is a X-linked Recessive disease controlled by single gene,h. The h gene has 2 alleles, contrasting character H = dominant --- disease free; h = recessive ------ diseased only in Homozygous Recessive condition. It is Monogenic.
Cystic Fibrosis ---- is Autosomal Recessive disorder and controlled by a single gene so is Monogenic.
Blood type ---- in human blood type is of 2 types : ABO grouping and Rh factor. Rh factor inherit in dominant/recessive pattern and is Monogenic. ABO blood grouping is due to I gene and inherits in codominant manner. The I gene occurs in 3 alleleic forms IA, IB and i. It is Monogenic but had multiple Alleles.
So, correct Option is C, Height.
Thank you.?