Which genotype is homozygous recessive for an allele R?

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Study for the 9th Grade Biology SOL Test. Prepare with flashcards and multiple choice questions, each featuring hints and explanations. Get ready for your exam!

Multiple Choice

Which genotype is homozygous recessive for an allele R?

Explanation:
Homozygous recessive means both copies of the gene are the recessive allele. For allele R, the recessive form is lowercase r, so having two of them—rr—fits this requirement. That genotype is two recessive alleles, so it’s homozygous recessive. Any genotype with at least one dominant allele (R) is not recessive homozygous, such as Rr (one dominant, one recessive) or RR (two dominant). A combination like rR is just another way to write Rr, still heterozygous.

Homozygous recessive means both copies of the gene are the recessive allele. For allele R, the recessive form is lowercase r, so having two of them—rr—fits this requirement. That genotype is two recessive alleles, so it’s homozygous recessive. Any genotype with at least one dominant allele (R) is not recessive homozygous, such as Rr (one dominant, one recessive) or RR (two dominant). A combination like rR is just another way to write Rr, still heterozygous.

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