Name: Polygenic Inheritance
Uploaded: 2019-07-19
Duration: 6 min 52 s
Description: Human skin and eye colour are examples of polygenic inheritance. This video explains the concept and examples of polygenic inheritance. Learn more.

Question

State and explain Mendel's law of segregation with the help of a suitable cross.

Accepted Answer

The law of segregation states that during the production of gametes, two copies of each hereditary factor segregate so that offspring acquire one factor from each parent. In other words, allele pairs segregate during the formation of gamete and re-unite randomly during fertilization. This is also known as Mendel’s third law of inheritance.

This law states that two members of the allelic pair without being contaminated, stay together when a pair of genes are brought together in a hybrid, and the two separate from each other when gametes are formed from the hybrid, and only one enters each gamete as seen in monohybrid and dihybrid cross.

This is the reason that the law of segregation is also described as the law of purity of gametes. Mendel made a cross between two pure plants having contrasting characters for a single plant called monohybrid cross. Pure tall and dwarf plants were crossed by Mendel. All the plants are tall hybrids that belonged to the F1 generation which were self-pollinated. The plants were both tall and dwarf of the F2 generation in approximate 3:1 ratio phenotypically and 1:2:1 genotypically.

State and explain Mendel's law of segregation with the help of a suitable cross.

Important Questions on Principles of Inheritance and Variation

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