Biology

Inheritance of One and Two Genes

Biology·Prelims Questions

Monohybrid and Dihybrid Crosses — Prelims Questions

NEET UG
Version 1Updated 21 Mar 2026
Q1easy

In a monohybrid cross between two heterozygous pea plants (Tt x Tt), where 'T' is the allele for tallness and 't' is the allele for dwarfness, what is the expected genotypic ratio in the F2 generation?

Q2medium

A dihybrid cross between two pea plants heterozygous for seed shape (Round, R; wrinkled, r) and seed color (Yellow, Y; green, y) (RrYy x RrYy) is performed. What proportion of the F2 offspring are expected to have wrinkled, green seeds?

Q3medium

A tall pea plant with yellow seeds (phenotype) is crossed with a dwarf pea plant with green seeds. All F1 offspring are tall with yellow seeds. If the F1 plants are self-pollinated, what is the expected phenotypic ratio in the F2 generation?

Q4easy

A test cross is performed on a pea plant with round seeds. The offspring produced are 50% round seeds and 50% wrinkled seeds. What is the genotype of the parent pea plant with round seeds?

Q5hard

In a dihybrid cross, if two genes are linked and located very close to each other on the same chromosome, which of Mendel's laws would likely be violated?

Q6medium

In a monohybrid cross, if the F1 generation shows a phenotypic ratio of 1:2:1 instead of 3:1, what type of inheritance pattern is most likely at play?

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