Question

Test cross involves
(a) crossing between two F₁ hybrids
(b) crossing the F₁ hybrid with a double
recessive genotype
(c) crossing between two genotypes with
dominant traits
(d) crossing between two genotypes with
recessive traits

Answer 1

Answer:

Option d is right

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Answer 2

Dear Student,

◆ Answer -

(b) crossing the F₁ hybrid with a double

recessive genotype

◆ Test cross -

- Test cross is cross between individual with unknown genotype and an individual with a phenotypically recessive individual.

- It helps ti determine zygosity (homozygous/heterozygous) of individuals showing dominant traits.

# Designing a test cross -

Let's take a cross between F1 hybrid of round and wrinkled seeds with homozygous plant with wrinkled seeds.

- Parents : F1 hybrid (Rr) × Homozygous recessive (rr)

- Gametes : R & r × r

- Progeny : Round seeds (Rr), Wrinkled seeds (rr)

Here, ratio of round seeds : wrinkled seeds is 1 : 1.

Hope this helps you...