is it possible for 2 organisms to have different phenotypes but the same genotype?

Question

also is it possible for 2 organisms to have different genotypes but the same pheotype?

Answer 1

1) No. If two organisms have the same genotype they have the same dominant or recessive genes for certain traits. They would express those genes in the same way, so their phenotypes would have to be the same.

2) Yes. Two organisms may have different genotypes for a trait such as ear lobes, but because they each have at least one dominant gene the trait will be exhibited. In other words, one organism may be homozygous dominant and the other organism may be heterozygous. They will both have the same phenotype - expression of the trait - because they both have at least one dominant gene. They would have the same phenotype.

Answer 2

To the first question; yes, you can have an organism with the same genotype and different phenotype. For example; take twins and feed one very well, while feeding the other not so well. The well fed twin will respond to his genotype potential, say for height. The other will be of stunted growth. Remember, the phenotype is composed of the genotype and the environment. The second question does not sound possible, as unique environments would vary.

Answer 3

Question:
Is it possible for two organisms to have different phenotypes but the same genotype?

Answer:
Yes, but this is not possible at birth, but certain events during ones life can cause this. For instance, even identical twins can appear different if they grow up separately. However, their natural phenotypes will be identical because their genotypes are identical. (Identical twins don't actually have the same DNA, its just similar, but we will assume they do for the sake of this example.)

Basically, the answer is yes only because phenotypes can be altered by the environment. This is known as "Phenotypic Plasticity".

Question: Is it possible for two organisms to have different genotypes but the same phenotype?

Answer:
Yes. This is quite frequent and natural. If the dominant allele is A, and the recessive allele is a, then genotypes AA and Aa both result in the same phenotype. Other times when this can occur are also quite common.

Answer 4

yes, phenotypic plasticity is when organisms with the same genotype can express different phenotypes based on different environmental cues, such as the same species of butterflies having different wing colors and patterns