Question

Smooth pod shape (S) is dominant over constricted pod shape (s) in pea plants. Fill in
the Punnett square and determine the expected genotypic and phenotypic ratios by
crossing homozygous recessive and homozygous dominant parents.
GENOTYPES _____________________
GENOTYPIC RATIO ________________
PHENOTYPES ____________________
PHENOTYPIC RATIO _______________
and make a punett box

Answer 1

Punnet square and the blanks will be filled as follows:

Explanation:

• The punnet square can be made as follows:

           s            s

S      Ss          Ss

S       Ss          Ss

• The genotype of offspring will be heterozygous dominant Ss.

• The genotypic ratio will be 0:0:1 as all the offsprings will be Ss.

• The phenotype of the offspring will be smooth pod shape.

• The phenotypic ratio of the offspring will be 1:0 are the offspring will have the characteristics of the dominant parent.