Bronze turkeys have at least 1 dominant allele R. Red turkeys are homozygous for
ID: 15424 • Letter: B
Question
Bronze turkeys have at least 1 dominant allele R. Red turkeys are homozygous for its recessive allele r.
Another dominant gene H produces normal feathers, and the recessive genotype hh produces feathers lacking webbing, a conditions termed "hairy". In crosses between homozygous bronze, hairy birds and homozygous red, normal-feathered birds, what proportions of the F2 progeny will be:
(a) genotype Rrhh?
(b) pheontype Bronze, hairy?
(c) genotype rrHH?
(d) phenotype red normal-feathered?
(e) genotype RrHh?
(f) phenotype bronze normal feather?
(g) genotype rrhh?
(h) genotype RRHh?
(I) double heterozygotes within the population of turkeys with the red normal feathered phenotype?
Explanation / Answer
Bronze turkeys have at least 1 dominant allele R
. Red turkeys are homozygous for its recessive allele r.
dominant gene H produces normal feathers, and
recessive genotype hh produces feathers lacking webbing, a conditions termed "hairy".
In crosses between homozygous bronze, hairy birds and homozygous red, normal-feathered birds, what proportions of the F2 progeny will be:
homozygous bronze, hairy birds--------- RRhh
homozygous red, normal-feathered birds,--------rrHH
RRhh X rrHH
RrHh ------------------ F1 progeny
RrHh X RrHh
RH
Rh
rH
rh
RH
RH RH
RH Rh
RH rH
RH rh
Rh
RH Rh
Rh Rh
Rh rH
Rh rh
rH
RH rH
Rh rH
rH rH
rH rh
rh
RH rh
Rh rh
rH rh
rh rh
(a) genotype Rrhh? 2/16
(b) pheontype Bronze, hairy? 4/16
(c) genotype rrHH? 1/16
(d) phenotype red normal-feathered? 3/16
(e) genotype RrHh? 4/16
(f) phenotype bronze normal feather? 9/16
(g) genotype rrhh? 1/16
RH
Rh
rH
rh
RH
RH RH
RH Rh
RH rH
RH rh
Rh
RH Rh
Rh Rh
Rh rH
Rh rh
rH
RH rH
Rh rH
rH rH
rH rh
rh
RH rh
Rh rh
rH rh
rh rh
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