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Alex
4 years ago
9

How many possible genotypes and phenotypes are there for a single gene trait that shows dominance in any given population? A.One

genotype, one phenotype
B.Two genotypes, two phenotypes C.Three genotypes, two phenotypes D.Two genotypes, three phenotypes
Biology
2 answers:
Nuetrik [128]4 years ago
8 0
Let D be the dominant allele and d be the recessive allele. Possibilities:
DD (dominant phenotype)
Dd (dominant phenotype)
dd (recessive phenotype)

Therefore, there are three genotypes, two phenotypes.

The answer is C.
Ostrovityanka [42]4 years ago
4 0
The answer is <span>C.Three genotypes, two phenotypes.

Imagine gene for flower colors. Let A allele be dominant and a allele be recessive allele for the trait. A allele is responsible for red color and a allele for white color

The genotypes are:
1. AA
2. Aa
3. aa

However, there will be only two phenotypes:
1. red flowers
2. white flowers

This is because of the dominance of A allele over a allele. So, red flowers will have plants with genotypes AA and Aa while white flowers will have plants with genotype aa.</span>
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