Is it possible for organisms to possess different genotypes despite having same phenotype?

Answer 1

Same phenotype but different genotype is possible due to presence of dominant allele. A dominant allele , when present in genotype, always expresses itself: both in double dose and in single dose.

A person can have a dominant allele on both the homologous chromosomes (i.e. in double dose) while another person may have single dominant allele and a corresponding recessive allele.

In both the above cases the trait controlled by dominant allele will be expressed and hence there will be no distinction in phenotype.
This phenomenon is seen in all organisms including plants.

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In human, dominant eye colour is expressed in both homozygous dominant and heterozygous dominant individuals.

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Answer 2

Benjamin Alvin

Yes, organisms can have different genotypes while exhibiting the same phenotype due to genetic variations and different combinations of alleles.

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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.