Platypuses can have tail shape [forked (F) or oval (O)], and beak colour [purple (P) or brown (B)]. Assume that each trait is caused by a single gene in which one allele is completely dominant to the other.

Look at the table to the right and determine the dominant and recessive alleles for beak colour and tail shape.

Once you've figured those out, you can next determine the genotypes of the parents.

PHENOTYPE (Letters) and Quantity of Progeny (Numbers)
PARENT
OFFSPRING
Male Female BO PO PF BF
(Row 1) PO PO 0 48 0 0
(Row 2) PO BF 16 11 16 11
(Row 3) PF PO 0 0 45 14

BEAK COLOUR

Dominant symbol
Recessive symbol

TAIL SHAPE

Dominant symbol
Recessive symbol