Given the progeny, write all possible genotypes for BOTH parents, list the proportion of each progeny type you think the cross must have produced.
SHOW WORK. A single autosomal gene affects fur color in a particular breed of hamster, and there are multiple alleles of this gene in hamster populations. The table below gives each allele designation and shows how each allele affects fur color.
Black is dominant to sable which is dominant to chocolate which is dominant to cream, forming an allelic series (so F1 > F2 > F3> F4). All progeny phenotypes are listed for each of the crosses below, and assume in each case that huge numbers of progeny were scored for each cross.
Examine the progeny produced by each cross. Given the progeny, write all possible genotypes for BOTH parents of each of the following crosses A-C. Please use the allele designations provided above. In cases where the cross produced more than one progeny type, list the proportion of each progeny type you think the cross must have produced.
Cross A: Mother is chocolate and father is cream.
Progeny types include chocolate and cream.
Cross B: Mother is black and father is chocolate.
All progeny was black.
Cross C: Mother is black and father is sable.
Progeny types include black, sable, and cream.
D. You have a black hamster of unknown genotype. Show the BEST cross you could set up to determine the genotype of this animal. PLEASE SHOW THE GENOTYPES OF BOTH CROSS PARENTS, using dashes where appropriate. (Don’t list the offspring.)