High School

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Suppose a dominant allele (N) codes for a big nose, and a recessive allele (n) codes for a small nose. Imagine that an organism receives a dominant allele from its mom and a dominant allele from its dad. What can be determined about its genotype and phenotype?

A. The organism has a large nose because it's homozygous.
B. The organism has a large nose because it's heterozygous.
C. The organism has a small nose because it's heterozygous.
D. The organism has a small nose because it's homozygous.

Answer :

A. The organism has a large nose, because it's homozygous.

If the organism got from its mom a dominant allele, and from its dad a dominant allele also, the organism will be homozygous dominant. The dominant characteristic is a large nose, therefore the organism will have a large nose as he is homozygous dominant for that trait. If he was heterozygous, he would still have a large nose because it is the dominant trait. To have a small nose, the organism would have to receive from its parents, two recessive alleles.

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