Question

difference between the law of dominance and law of regression

Answer 1

Bonjour!!

Here's your answer.

$\textbf{LAW OF DOMINANCE :}$

✳ Law of Dominance states that when two homozygous individuals with one or more sets of contrasting characters are crossed, the F1 hybrids have both the contrasting genes of a pair but only one expresses and it does not allow other one to appear. The one that is expressed is $\textbf{dominant}$
and the other which remains masked is $\textbf{recessive}$. The recessive genes express only when both the genes of a pair are recessive.


$\textbf{LAW OF SEGREGATION :}$

✳ Law of Segregation states that in a heterozygote (hybrid), the two members of the allelic pair remain together without blending. When gametes are formed from the hybrid, the two genes seperate out (or segregate out) and only one enters each gamete.
In the F1 gametes, 50 per cent of gametes from even parent have dominant gene $\textbf{(T)}$ and the other 50 per cent have recessive gene $\textbf{(t)}$. They fuse randomly to produce different combinations : $\textbf{TT, Tt, tT}$ and $\textbf{tt}$.
Of these genes in F2 generation, the plants with $\textbf{TT, Tt}$ are all tall and the plants with $\textbf{tt}$ are short. But only one-third tall plants of them are homozygous $\textbf{(TT)}$, while two-thirds are heterozygous with genotype $\textbf{Tt}$. The tall or short character is their $\textbf{phenotype}$.

Hope it helps.
@charlie16.

Answer 2

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Equal Segregation of Alleles

The allele that contains the dominant trait determines the phenotype of the offspring. In essence, the law states that copies of genes separate or segregate so that each gamete receives only one allele.