Question

Which of the following human features can be the same?
(a) Height
(b) Weight
(c) A and B
(d) None of the above

Answer 1

Hint: Humans show polygenic inheritance, where a single trait of a human depends on more than one gene. Gene also shows the difference in alleles which brings variation depending upon the degree of dominance and gene expression.

Complete Answer:
Human height and color depend upon the parental gene combination and the weight of a person depends on its body mass index. The human population shows variation but still, some people have similar height, weight, and color which not only depend on genes but also depend on hormone secretion and nutrition.

Additional information:
Human blood group is of four types A, B, AB and O. Human population shows resemblance in the case of blood groups which depend on genes of both the parents. Blood group is an example of codominance where two contrasting alleles of the same gene lack the relationship of dominance and recessive. In this, both alleles produce independent effects where the blending of alleles are absent. Blood group controlled by gene I, which contains isoagglutination to control the sugar of red blood cells. In the case of the I and i gene only I express itself because due to the absence of sugar in my gene it cannot express itself. Blood group A consists of antigen N- acetyl galactosamine at the terminal of glycosphingolipid and blood group B consists of galactose at the terminal. Due to the presence of three different alleles in the blood group six different genotype forms.

So, the correct answer is ‘A and B’.

Note: Human populations show a bell shape graph due to continuous variation in phenotype. In this graph, the middle curve portion shows a large number of populations with some similar characteristics, and extreme curves have a minimum population.