An example of epistasis is:
Correct answer: B. Gene E hides the effect of coat colour gene in dogs
- A. Human height is controlled by 180 genes
- B. Gene E hides the effect of coat colour gene in dogs
- C. Human blood groups are determined by three alleles
- D. The gene for flower colour in pea plants also affects the seed coat colour
Explanation
Epistasis occurs when the effects of one gene are modified or masked by one or several other genes. In the correct example, 'gene E hides the effect of coat colour gene in dogs,' gene E suppresses or alters the expression of another gene responsible for coat colour, exemplifying epistasis. Option A refers to polygenic inheritance, where multiple genes affect a single trait, such as height. Option C describes the concept of multiple alleles in determining traits like blood type, and Option D illustrates pleiotropy, where one gene influences multiple phenotypic traits.
Last updated
About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
Practise Inheritance
1,238 free Inheritance MCQs from Biology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Biology questions like this
Biology is on 6 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A carrier of haemophilia is typically
A chromosome have two genes X and Y. Gene Y influences the phenotypic effect of gene X.Based on the influential phenotypic effect, the gene Y is:
A colour blind man marries a woman with normal vision whose father was colour blind. What proportion of their daughters will be colour blind?
A couple has blood group A and B, respectively. The blood group of their son is AB and the daughter has blood group O.The parents and the children have four different genotypes for the same trait because the:
A gene which affects two or more unrelated characteristics is called