NEET BIOLOGY

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GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Mating an individual expressing a dominant phenotype but those genotype is unknown with an individual expressing the corresponding recessive phenotype is an example of
A
a heterozygous cross.
B
an F1 cross.
C
a self cross.
D
a test cross
Explanation: 

Detailed explanation-1: -Specifically, to detect the underlying genotype of an organism with a dominant phenotype, one must do a type of breeding analysis called a test cross.

Detailed explanation-2: -A test cross is a breeding experiment in which an organism with an unknown genotype associated with the dominant phenotype is mated to an organism that is homozygous for the recessive phenotype. The Punnett square in Figure 8 can be used to consider how the identity of the unknown allele is determined in a test cross.

Detailed explanation-3: -So, the correct answer is “ Test cross".

Detailed explanation-4: -test cross-The mating between an individual of unknown genotype for a particular characteristic and an individual that is homozygous recessive for that same characteristic. The testcross can be used to determine the unknown genotype (homozygous dominant versus heterozygous).

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