Genetics (Gene Interaction, Pleiotropic Gene) MCQ Test - Botany, Class 12 - Class 12 MCQ

 Multiple alleles are present :-

A scientist performed the gene mapping experiments in maize. He mapped the genes on chromosomes on the basis of % crossing over between different genes. One map unit corresponds to one % crossing over or recombination. The genes showing more than 50% recombination were not supposed to be linked on same chromosome. In crossing over studies on maize, scientist observed the following % crossing over between genes A, B, C, D –between. A and D 10%, between A and C 3%, between genes C and D 7%, between genes A and B 5%, and between genes C and B 8%.On the basis of above observation find out the correct sequence of genes A, B, C and D on chromosomes:-

In a cross between individuals homozygous for (a, b) and wild type (+ +). In this cross 700 out of 1000 individuals were of parental type. Then the distance between a and b is :-

n maize coloured endosperm (C) is dominant over colourless (c) and full endosperm (R) is dominant over shrunken (r). When a dihybrid of F₁-generation was test crossed it produced four phenotypes in the following percentage

Coloured and Full = 45%

Coloured – Shrunken = 5%

Colourless – Full = 4%

Colourless  – Shrunken = 46%

From these data what would be distance between the two non allelic genes :-

In totmato, genotype aabbcc produces 100g tomatoes and AABBCC produces 160g tomatoes. What is contribution of each polygene in the production of tomatoes:-

In a family, father has a blood group 'A' and mother has a blood group 'B'. Their children show 50% probability for a blood group 'AB' idicating that –

Which of the following show linkage group in coupling phase :-

 When a red grain variety of wheat is crossed with another white grain variety a F₁-hybrid is produced.On selfing of this F₁- hybrid, how many offsprings of F₂ - generation resemble phenotypically to it's parents (let grain colour of wheat controlled by three gene pairs )

Epistasis differs from dominance because

In a plant flower colour is the example of polygenic trait and controlled by one gene pair. How many plants show parental phenotype in F₂ generation:–

In Drosophila several alleles exhibit same phenotype for eg. W^+s, W^+c, W^+g exhibit eye colour these alleles are called :–

A) Pleiotropic genes have multiple phenotypic effect.

(B) Muliple alleles exhibit same phenotypic expression.

(C) Polygenes exhibit continuous variation.

Which is not correctly matched :

In Drosophila a set of homeiotic genes which controls body plan at the time of organ differentiation known as :

The longer the chromosome of an organism, the more genetic variability it gets from :-

Which statement is incorrect about linkage

In a genetic cross having recessive epistasis, F₂ phenotypic ratio would be

Which of the following is not a hereditary disease

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy 

Haemophilia is more commonly seen in human males than in human females because – 

A man and a woman,who do not show any apparent signs of a certain inherited disease, have seven children (2 daughters and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease 

Grain colour in wheat is determined by three pairs of polygenes. Following cross AABBCC (dark colour) x aabbcc (light colour), in F₂ generation what proportion of the progeny is likely to resemble either parent ?

What ratio is expected in offsprings if father is colour blind and mother's father was colour blind :-

 Independent assortment of genes does not takes place when 

What is true for monoclonal antibodies :–

Ratio of complementry genes is 

A and B genes are linked. What shall be genotype of progeny in a cross bet. AB/ab and ab/ab :