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(B) In chickens,comb shape is determined by two gene pairs,$R$ and $P$. The interaction is as follows: Walnut comb $(R-P-)$,Rose comb $(R-pp)$,Pea com

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$RR\ PP 	imes rr\ pp$

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(B) In chickens,comb shape is determined by two gene pairs,$R$ and $P$. The interaction is as follows: Walnut comb $(R-P-)$,Rose comb $(R-pp)$,Pea comb $(rrP-)$,and Single comb $(rrpp)$.Since the $F_1$ generation consists entirely of walnut-combed chickens $(R-P-)$,the walnut-combed parent must be homozygous dominant for both traits $(RR\ PP)$ to ensure that all offspring receive at least one dominant allele for both genes ($R$ and $P$).The single-combed parent is recessive for both traits,having the genotype $rr\ pp$.Therefore,the cross is $RR\ PP 	imes rr\ pp$.

$A$ farmer crossed a walnut-combed chicken with a single-combed one and obtained all walnut-combed chickens in $F_1$. The genotype of the parents was

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