GAT-B Practice Quiz

Question 1

In pea plants, tall stem (T) is dominant over dwarf stem (t). When two heterozygous tall plants are crossed (Tt × Tt), what proportion 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 offspring?

Accepted Answer

All round

Question 3

In a monohybrid cross Aa × Aa, what is the probability that an offspring showing the dominant phenotype is heterozygous?

Accepted Answer

2/3

Question 4

In a dihybrid cross AaBb × AaBb, what is the probability of obtaining an offspring that is homozygous recessive at exactly one of the two loci?

Accepted Answer

3/8

Question 5

In peas, yellow seed color (Y) is dominant over green (y), and round seed shape (R) is dominant over wrinkled (r). Two plants with genotype YyRr are crossed. What fraction of offspring is expected to be green and wrinkled?

Accepted Answer

1/16

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