Question

In each case where Gregor Mendel crossed true-breeding plants as parents (for example: TT x tt), the offspring displayed only ONE of the two traits seen in the parents. However, the missing trait sometimes reappeared in the F2 generation. This observation supports which principle of genetics?

a) Principle of Dominance
b) Principle of Independent Assortment
c) Principle of Segregation
d) Principle of Incomplete Dominance

Answer 1

Gregor Mendel's observations where only one parent's trait appeared in the F1 generation and the recessive trait reappeared in the F2 generation supports the Principle of Segregation, underscoring that alleles from each parent segregate during gamete formation.

Step-by-step explanation:

Understanding Gregor Mendel's Genetic Principles :

The observation that in cases where Gregor Mendel crossed true-breeding plants (for example: TT x tt), the offspring displayed only one of the traits seen in the parents, while the missing trait reappeared in the F2 generation, supports the Principle of Segregation. The Principle of Segregation explains that individuals have two alleles for each gene, which segregate during the formation of gametes, resulting in offspring receiving one allele from each parent. When heterozygous plants (F1 generation) are self-crossed, the recessive traits can reappear in the F2 generation in a predictable 3:1 dominant-recessive phenotypic ratio, which Mendel observed in his experiments.