what does the notation rr mean to geneticists?
a-heterozygous allelesb-homozygous allelesc-dominant allelesd-recessive alleles

R: dominant allele
r: recessive allele

Heterozygous: two different alleles
Homozygous: two of the same allele

Rr is therefore Heterozygous (A), because there is 1 dominant and 1 recessive allele --> two different alleles. Hope this helps! :)

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