Home › Tamil Nadu SSLC (Class 10) › Biology › Genetics › In a dihybrid cross, the 9 : 3 : 3 : 1 phenotypi…
In a dihybrid cross, the 9 : 3 : 3 : 1 phenotypic ratio of the F2 generation is a direct demonstration of which of Mendel's laws?
ALaw of independent assortment
BLaw of dominance of factors
CLaw of segregation of factors
DLaw of recapitulation theory
Answer & Solution
Correct answer: A. Law of independent assortment
1. A dihybrid cross follows two pairs of traits, such as seed shape and seed colour, at once.
2. The appearance of new combinations like round-green and wrinkled-yellow shows the two trait pairs are inherited independently.
3. This independence is the law of independent assortment, option A.
4. The law of segregation explains the 1:2:1 of a single gene, not the four-way 9:3:3:1, which rules out option C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Mendel's Laws", p.271_
Related questions
Which one of these is found in human males only?Sickle cell anaemia results from a change in the nucleotide sequence of a single gene. ThiThe gain or loss of one or more chromosomes from a normal set, as seen in Trisomy and MonoDown's syndrome in humans is caused by the presence of an extra copy of which chromosome?In the context of human sex chromosomes, why is the human female described as homogametic?If an egg carrying X fuses with a sperm carrying Y, what will be the sex chromosome make-uIn humans, the sex of a child is determined by the type of sex chromosome carried by whichWhich enzyme binds at the origin of replication and separates the two strands of the DNA m