Define and design a test − cross? | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

Question: Define and design a test − cross?

Answer:

Test cross is a cross between an organism with unknown genotype and a recessive parent. It is used to determine whether the individual is homozygous or heterozygous for a trait.

If the progenies produced by a test cross show 50% dominant trait and 50% recessive trait, then the unknown individual is heterozygous for a trait. On the other hand, if the progeny produced shows dominant trait, then the unknown individual is homozygous for a trait.

Cross between homozygous (unknown) individual and homozygous recessive individual

Cross between heterozygous (unknown) individual and homozygous recessive individual

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Comments

Pradeep
2019-10-13 20:15:05

ððð

sanju sheikh
2017-01-14 16:12:33

If the unknown progeny is dominent 100 percent in cross ...then what is that cross called..

Nosib khan
2016-12-30 22:03:13

Thanks

sushil mishra
2016-08-03 21:58:46

its soo gud

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Welcome to the NCERT Solutions for Class 12 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 5: Define and design a test − cross?....

Define and design a test − cross? | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

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