Question

In a monohybrid cross between two heterozygous pea plants (Pp x Pp), what is the expected phenotypic ratio of the offspring?

• A. 3:1
• B. 1:2:1
• C. 1:1
• D. 4:0

Hint:

A monohybrid cross between two heterozygous individuals typically produces a 3:1 phenotypic ratio, where the dominant allele masks the expression of the recessive allele.

Answer 1

The Correct Option is A

During a monohybrid cross of two heterozygous pea plants (Pp x Pp), allele segregation follows Mendelian inheritance. The offspring can have the following genotypes:
- PP (homozygous dominant)
- Pp (heterozygous)
- pp (homozygous recessive)
A Punnett square is employed to ascertain genotypic and phenotypic ratios.
- The genotypic ratio is:
- 1 PP : 2 Pp : 1 pp
As P (dominant) confers the dominant phenotype and p (recessive) confers the recessive phenotype, the phenotypic ratio is:
- 3 dominant (PP and Pp) : 1 recessive (pp)
Therefore, the predicted phenotypic ratio for the offspring is 3:1.