I would say a homozygote and a heterozygote for one trait, right?
2007-07-23 13:27:43 · 2 answers · asked by swt16 1 in Science & Mathematics ➔ Biology
You are right. It doesn't matter if the heterozygote is crossed with a homozygous dominant (Rr x RR) or with a homozygous recessive (Rr x rr) because your question asks about the genotype ratio in the offspring, not the phenotype ratio.
Rr x RR produces 1Rr:1RR.
Rr x rr produces 1Rr:1rr.
Both of these are 1:1 genotype ratios.
2007-07-23 13:46:07 · answer #1 · answered by ecolink 7 · 0⤊ 0⤋
no this would be a homo for dominant BB with a homo for recessive bb, which would yield all Bb offspring. genotypic ratio of 1:2:1 would be two hetero Bb crossed.
a phenotypic ratio of 1:1 would be the result of a hetero Bb with a homo recessive bb. which would express as two showing the recessive and two showing the dominant trait
2007-07-23 13:36:20 · answer #2 · answered by Bio-student Again(aka nursegirl) 4 · 0⤊ 0⤋