A polygenic trait is the one that is governed by more than one gene. Human skin colour is a polygenic trait governed by three pairs of genes where dominant allele of each gene express only a part of trait and the full trait is expressed only in presence of dominant alleles of all multiple genes, is called polygenic inheritance.
English
50 Questions
200 Marks
45 Mins EnglishIf a trait is influenced by three or more genes, then in a situation of inter crossing of the heterozygote of all the three or more genes would produce offspring, which can be represented by which of the following graph?
Which of the following is not an example of trisomy condition in human beings? Identify those and answer from the codes given below:
A. Patau syndrome
B. Edward syndrome
C. Turner syndrome
Codes:
When a red flowered Mirabilis jalapa plant I was crossed with that of white flowered plant II then in the offspring only pink coloured flowers appear on plant. Which of the following phenomena correctly explain this experiment and result?
When a female Drosophila having white eye trait (X-linked) is crossed with a male having dominant red eye trait, what would be the possibility of these traits in the offspring of F1 generation?
F₁ heterozygote of a dihybrid cross, when test crossed with a homozygous recessive parent, produces offspring in the ratio 1 : 1 for the two parental types. Which interpretation is correct?
(1) The genes of the two traits are complementary.
(2) Such a result is not possible.
(3) The genes in the cross are completely linked.
Choose the correct answer from the codes given below:
