Question

A cross between round seed pea plant (RR) and wrinkled seed pea plant(rr) resulted in progeny that were all round seed plants because

• A. Wrinkled seeds is the dominant trait
• B. Round seeds is the dominant trait
• C. Round seeds is the recessive trait
• D. Form of seed in pea plant is not governed by gene 'R' or 'r'

Answer 1

Answer: (B)

Round seeds is the dominant trait

A cross between homozygous round seeds plant (RR) and homozygous wrinkled seeds plant (rr) produced all the F1 offspring with round seeds. This is because the round shape is determined by the dominant allele. According to the Law of Dominance, in a heterozygous individual, the phenotype will be determined by the dominant allele as recessive allele is inexpressive in the presence of dominant allele.

Hence, the correct answer is ‘Round seeds is the dominant trait’