If an organism expresses a recessive phenotype, can you tell the genotype?

Answer 1

Simply yes.

When an organism exhibits a recessive phenotype, it can only have one possible genotype. For instance, brown eyes (B) are dominant over blue eyes (b). If an organism has blue eyes, its genotypic combinations can only be (bb) because the dominant gene cannot be present in that organism.

I hope that was clear.

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Answer 2

Gabriella Anderson

If an organism expresses a recessive phenotype, it could have one of two possible genotypes: either it is homozygous recessive (two copies of the recessive allele) or it is heterozygous (one copy of the recessive allele and one copy of the dominant allele).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.