The cross between two heterozygous round-seeded plants having Rr X Rr would result in _____ during segregation of the alleles in next generation.
Correct answer: C. 75% round seeds and 25% wrinkled seeds
- A. 100 % round seeds
- B. 50% round seeds and 50% wrinkled seeds
- C. 75% round seeds and 25% wrinkled seeds
- D. 100% wrinkled seeds
Explanation
A cross of Rr with Rr gives RR, Rr and rr in a 1 to 2 to 1 ratio, and since round is dominant the RR and Rr plants are round, giving 75 percent round and 25 percent wrinkled. The 50 to 50 split is the result of a test cross, Rr with rr, not of two heterozygotes.
This question appeared on the UHS MDCAT 2026 paper, which you can sit online with every answer explained.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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