NEET PG DENTAL EXAM

EMBRYOLOGY

CHROMOSOMES AND CELL DIVISIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is an example of a heterozygous genotype?
A
RR
B
Rr
C
rr
D
None of the above
Explanation: 

Detailed explanation-1: -If there are two different versions, it is a heterozygous genotype for that particular gene. Another example is heterozygous for the colour of hair, which corresponds to having one allele for brown hair and the other alleles for red hair.

Detailed explanation-2: -Together, these alleles are called a genotype. If the two versions are different, you have a heterozygous genotype for that gene. For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair.

Detailed explanation-3: -Individuals carrying two identical alleles (RR or rr) are known as homozygous. While individual organisms bearing different alleles (Rr) are known as heterozygous.

Detailed explanation-4: -The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape. In the image above, a monohybrid cross is performed between plants that are heterozygous for round seed shape. The predicted inheritance pattern of the offspring results in a 1:2:1 ratio of the genotype.

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