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Principles of Inheritance and Variation MCQs
Class XII Biology
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NCERT Based
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NEET Practice
📘 Concept Based
📝 Exam Level
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519 questions in this chapter
Question 281 of 519
📘 CLASS XII
Morgan coined the term _______ to describe the physical association of genes on a chromosome.
Morgan coined the term linkage to describe this physical association of genes on a chromosome.
Question 282 of 519
📘 CLASS XII
The genes white and yellow in Drosophila were very tightly linked and showed only _______ per cent recombination.
The genes white and yellow were very tightly linked and showed only 1.3 per cent recombination.
Question 283 of 519
📘 CLASS XII
The genes white and miniature wing in Drosophila showed _______ per cent recombination, indicating looser linkage.
White and miniature wing genes showed 37.2 per cent recombination.
Question 284 of 519
📘 CLASS XII
Traits generally controlled by three or more genes, such as human height or skin colour, are called as _______ traits.
Traits generally controlled by three or more genes are called as polygenic traits.
Question 285 of 519
📘 CLASS XII
Besides the involvement of multiple genes, polygenic inheritance also takes into account the influence of the _______.
Polygenic inheritance also takes into account the influence of environment.
Question 286 of 519
📘 CLASS XII
A single gene that can exhibit multiple phenotypic expression is called a _______ gene.
A single gene can exhibit multiple phenotypic expression, and such a gene is called a pleiotropic gene.
Question 287 of 519
📘 CLASS XII
_______ is an example of XO type of sex determination in which the males have only one X-chromosome besides the autosomes.
Grasshopper is an example of XO type of sex determination.
Question 288 of 519
📘 CLASS XII
The sex determination mechanism where males produce two different types of gametes (e.g., X or Y) is designated as male _______.
The production of two different types of gametes by males is designated to be the example of male heterogamety.
Question 289 of 519
📘 CLASS XII
In birds, females produce two different types of gametes (Z and W), a mechanism known as female _______.
In organisms like birds, the female produces two different types of gametes in terms of sex chromosomes (Z and W), representing female heterogamety.
Question 290 of 519
📘 CLASS XII
In the haplodiploid sex-determination system of honey bees, females are _______ having 32 chromosomes.
In honey bees, the females are diploid having 32 chromosomes.
