Question
State and explain the 'Law of Independent Assortment' with a suitable example.
✓
Answer
When the two homozygous parents differing in two pairs of contrasting traits are crossed, the inheritance of one pair is independent of the other. In other words, when a dihybrid (or poly hybrid) forms gametes, the assortment (distribution) of alleles of different traits is independent of their original combinations in the parents. This law of independent assortment can be explained with the help of a dihybrid cross and dihybrid ratio. The appearance of new combinations in the F2 generation proves the law.
Carry out a dihybrid cross for any two characters till the F2 generation with the phenotypic and genotypic ratio:
Explanation:A gamete that receives ‘Y’ for colour may receive ‘R’ for shape or ‘r’ for shape. This would result in the formation of YR and Yr types of gametes. Similarly, a gamete that receives ‘y’ for colour may receive ‘R’ or ‘r’ for shape. This would result in the formation of yR and yr types of gametes (Independent assortment).
Carry out a dihybrid cross for any two characters till the F2 generation with the phenotypic and genotypic ratio:
Explanation:A gamete that receives ‘Y’ for colour may receive ‘R’ for shape or ‘r’ for shape. This would result in the formation of YR and Yr types of gametes. Similarly, a gamete that receives ‘y’ for colour may receive ‘R’ or ‘r’ for shape. This would result in the formation of yR and yr types of gametes (Independent assortment).
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