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CB 1.3 GENETIC VARIATION
TRACKING GENES
Genotypic ratio of the offspring:
Phenotypic ratio of the offspring:
2. During one of Mendel’s investigations he found that a cross between two plants resulted
in 5474 round peas and 1850 wrinkled peas.
Use the phenotypic ratio of the peas produced to determine the probable genotypes of
the parent plants. You should:
•
calculate the simplest phenotypic ratio of the offspring.
•
explain how the phenotypic ratio can be used to determine the parent’s genotype.
•
use a Punnett square as part of your answer.
Genotypic ratio of the offspring:
Phenotypic ratio of the offspring:
(c) Plant 1 is a pure-breeding plant that produces round peas. Plant 2 produces
wrinkled peas.
Genotype of plant 1: Genotype of plant 2:
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