Biology, asked by Anonymous, 10 months ago

Describe back cross and test cross 12th students

Answers

Answered by Anonymous

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a. Back cross :

The F1 individuals obtained in

a cross are usually selfed to get the F2progeny.

They can also be crossed with one of the two

parents from which they were derived (either

recessive or dominant). Such a cross is known

as back cross.

b. Test cross :

The cross of F1 hybrid with the

homozygous recessive parent is known as a test

cross. It is used to test whether an individual is

homozygous (pure) or heterozygous(hybrid).

Test cross is easy, simple, repeatable and

predictable

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Answered by Anonymous

Answer:

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Back Cross:-

Backcrossing is a crossing of a hybrid with one of its parents or an individual genetically similar to its parent, in order to achieve offspring with a genetic identity which is closer to that of the parent.

Test cross:-

Test crosses are used to test an individual's genotype by crossing it with an individual of a known genotype. Individuals that show the recessive phenotype are known to have a homozygous recessive genotype. ... The purpose of a test cross is to determine if this individual is homozygous dominant or heterozygous.

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