Question

in order to find out the different type of gametes produced by a pea planet having the genotype AaBb it should be cross to a plant with the genotype
1. AaBb. 2. aabb. 3. AABB
4. aaBB......please explain ur answer

Answer 1

Ur ans is 2.
test cross:- it is method used to identify the genotype of an individual by crossing with recessive trait.
becoz in In genetics, a test cross, first introduced by Gregor Mendel, involves the breeding of an individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes.

Answer 2

Answer:

The correct answer is : 2. aabb

Explanation:

• In order to determine the types of gamete produced by a pea plant it needs to be crossed with another pea plant having a homozygous recessive genotype (aabb). This is known as Test Cross.
• This happens because an allele having a homozygous recessive genotype will not express itself in presence of a homozygous dominant or heterozygous dominant allele but will express itself in presence of homozygous recessive allele only.
• When a pea plant having AaBb genotype is crossed with a pea plant having aabb genotype, it will give rise to offspring with four different genotypes (AaBb, aaBb, Aabb, aabb) and having four different phenotypes, respectively.