Question

Two tall pea plants are crossed together. In its F1 generation , the probability of tallness will be.
1.100% or 75% tall
2.always 100% tall
3.Always 50% tall
4.100% or 50% tall ..
.
the correct answer is
option 1. 100% or 75% .. please explain how​

Answer 1

First of all tallness is the dominant trait .

And In F1 generation plants produced from the hybrid of tall parents were either tall or dwarf. There was no way for intermediate height(or medium height) .

Hope it may help you in your better understanding.

It's ishu here!!!

Answer 2

Two tall pea plants are crossed together. In its F1 generation , the probability of tallness will be

Two tall pea plants are crossed together. In its F1 generation , the probability of tallness will be1.100% or 75% tall

• This is the case of Monohybrid cross. Firstly, we should know that between the two traits tallness and dwarfness, tallness is a dominating character.
• We can take three cases here . First case involves cross between two homozygous (TT * TT) , second involves one homozygous and other heterozygous (TT * Tt) and third involves both heterozygous (Tt * Tt) .
• In the first case, the outcome of the cross will be 100% ( TT, TT , TT ,TT) as all the traits expressed are tall.
• In the second case too the outcome of the cross will be 100% ( TT, Tt , TT ,Tt) as all the traits expressed are tall.
• In the third case the outcome of the cross will be 75 % ( TT, Tt , Tt ,tt) . Here, first three will express tall character while the fourth will be dwarf.
• Hence, the correct answer is option 1. 100% or 75% .