If an organism expresses a recessive phenotype, can you tell the genotype?Explain your answer, & ans example?

Question

Help its for homework!

Answer 1

Yes. A recessive phenotype is only expressed if the individual has two recessive alleles. Say you have two alleles A and a. AA and Aa will render the same dominant phenotype or outward expression of the gene whereas aa gives the recessive phenotype. One dominant allele is all it takes to give a dominant phenotype. But aa is the only combo to give the recessive phenotype.

Answer 2

jineff is right. You asked for an example; how about blue eyes in humans, usually at least?

(Before I break up any happy families, I should point out that it is possible, although unusual, for someone with a brown eyed genotype to exhibit a blue-eyed phenotype through an accident of development).