CELL DIVISION
MEIOSIS AND GENETIC VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When a genotype has a dominant and recessive allele
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When a genotype has 2 copies of the recessive allele
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When a genotype has 2 copies of the dominant allele
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Detailed explanation-1: -An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
Detailed explanation-2: -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-3: -There are dominant homozygotes (i.e. RR individuals) and recessive homozygotes (i.e. rr individuals). An individual who carries two different alleles (i.e. Rr) is a heterozygote (hetero = different).
Detailed explanation-4: -A homozygous plant contains either of the following alleles for seed shape: (RR) or (rr). The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape.
Detailed explanation-5: -The heterozygous genotype (Rr) has the dominant round seed shape as its recessive allele (r) is masked in the phenotype.