AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

T=tall, t=short. Cross a heterozygous and a homozygous recessive. What would the genotype possibilities be of the offspring?

A	Tt, tt
B	TT, Tt, tt
C	TT, Tt
D	TT, tt

Explanation:

Detailed explanation-1: -In a cross between heterozygous tall plants (Tt) and a homozygous dwarf plant (tt), the ratio in the offspring shall be 1 tall : 1 dwarf. This is because the heterozygous plant will make two types of gametes, one type having T allele and the other having t allele. Hence, the correct answer is ‘1 tall : 1 dwarf’

Detailed explanation-2: -When a heterozygous plant is self crossed with itself in a monohybrid cross, the genotypic ratio obtained is TT:Tt:tt = 1:2:1.

Detailed explanation-3: -So, the correct option is ‘50%’.

Detailed explanation-4: -In F2 generation, the tall and dwarf plants will be produced in 3 : 1 ratio. Out of the three tall plants, one tall plant will be homozygous tall (TT) and two tall plants will be heterozygous tall (Tt).

There is 1 question to complete.