NEET MCQ on Polygenic Inheritance Quiz Questions

1. In corolla length of Nicotiana longiflora, polygenic inheritance was studied by

A Joseph Kolreuter B E.M. East C Francis Galton D Nilsson-Ehle

2. Marriages between close relatives should be avoided as it causes more

A Abnormalities in child birth B Mutations C Recessive alleles to come together D Multiple births

3. When two or more nonallelic gene pairs affect the same character in the same way, it is called

A pleiotropy B polygenic inheritance C additive expressivity D total penetrance

4. Polygenes exhibit

A Different phenotypes B Different genotypes C Similar genotypes and phenotypes D Both and

5. Raju and Rani are planning a family, but sas each has a brother having the sickle-cell disorder, they are worried that their kids might develop the disorder too Neither Raju, Rani nor their respective parents have the disorder They decide to consult a genetic counsellor who conveys them this

A its is possible that none of their kids will have the disorder, but blood tests on both of B all of their children will have sickle-cell disorder C one of four of their children can be expected to have sickle cell D there is no chance of any of their kids having sickle cell

6. Traits which exhibit continuous phenotypic variation are typically determined by this inheritance form

A incomplete dominance B polygene inheritance C multiple-allele inheritance D sex-linked inheritance

7. One of the X chromosomes in females is inactivated by

A environmental factors B enzymes coded for by mitochondrial DNA C number of dominant genes found on each X chromosome D epigenetic markers

8. Which of these illustrates pleiotropy?

A Matings between earless sheep and long eared sheep always result in short eared B Human cystic fibrosis causes many symptoms from respiratory distress to digestive C Wheat kerneis can range from white to red in color, a trait governed by multiple D The genes for scarlet eyes and hairy body in fruit flies are located on the same

9. Morphan’s syndrome is as a result of

A Polygene B Pseudogene C Modifier gene D Pleiotropic gene