GATE Life Sciences Practice Quiz

Question 1

In pea plants, tall stem (T) is dominant over dwarf stem (t). When two heterozygous tall plants are crossed, what fraction of the offspring is expected to be dwarf?

Accepted Answer

1/4

Question 2

A true-breeding round-seeded pea plant is crossed with a true-breeding wrinkled-seeded plant. If round (R) is dominant over wrinkled (r), what will be the phenotype of all F1 progeny?

Accepted Answer

All round

Question 3

In a trihybrid self-cross AaBbCc × AaBbCc, assuming independent assortment and complete dominance, what fraction of the offspring is expected to show all three recessive phenotypes?

Accepted Answer

1/64

Question 4

In a monohybrid cross with complete dominance, the phenotypic ratio is 3:1 in F2. What is the corresponding genotypic ratio?

Accepted Answer

1:2:1

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