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Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

ZoologyPrinciples of Inheritance and VariationMonohybrid and Dihybrid CrossesEasy2 minPYQ_2020
ZoologyEasysingle choice

A plant with genotype AABbCcDD is self-pollinated. Provided that the four genes are independently assorting, what proportion of the progeny will show the genotype AAbbccDD?

Options:

Answer:
B
Solution:

Gamete are formed by reductional division having half the chromosomal content of the parent cell. During the meiotic division, crossing over occurs resulting in formation of new combination. For the given genotype the gamete combination will be - ABCD, ABcD, AbcD, AbCD.

Mendel's law of independent assortment states that "the alleles of two (or more) different genes get sorted into gametes independently of one another."

On selfing, the outcome will be

 ABCDABcDAbCDAbcD
ABCDAABBCCDDAABBCcDDAABbCCDDAABbCcDD
ABcDAABBCcDDAABBccDDAABbCcDDAABbccDD
AbCDAABbCCDDAABbCcDDAAbbCCDDAAbbCcDD
AbcDAABbCcDDAABBccDDAAbbCcDDAAbbccDD


Thus, the genotype AAbbccDD will be expressed in 1/16th of progenies.

Stream:NTA_ABHYAS_NEETSubject:ZoologyTopic:Principles of Inheritance and VariationSubtopic:Monohybrid and Dihybrid Crosses
⏱ 2mℹ️ Source: PYQ_2020

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