Observe the given diagram of a genetic cross and match the labels (P, Q, R, S) in List I with their correct genetic terms or values in List II.

List I List II
A Process P 1 Heterozygous
B Genotype Q 2 $1:1$
C Genotype R 3 Homozygous recessive
D Ratio S 4 Test cross

Choose the correct answer from the options given below:

Question

Observe the given diagram of a genetic cross and match the labels (P, Q, R, S) in List I with their correct genetic terms or values in List II.

Choose the correct answer from the options given below:

Quantrex Academy · Accepted Answer

Correct answer: C. A-4, B-1, C-3, D-2

In the given cross, a violet flower (dominant phenotype) is crossed with a white flower (recessive phenotype).

Since the offspring are produced in a

50\% : 50\%

ratio of violet to white flowers, this indicates a test cross. Thus, Process P is a test cross (A

\rightarrow

4).

For a test cross to yield a

1:1

ratio, the dominant parent must be heterozygous. Therefore, Genotype Q is heterozygous (B

\rightarrow

1).

The white flower parent expresses the recessive trait, so its genotype must be homozygous recessive. Thus, Genotype R is homozygous recessive (C

\rightarrow

3).

The ratio of offspring is

50\% : 50\%

, which simplifies to

1:1

. Thus, Ratio S is

1:1

(D

\rightarrow

2).

The correct matching is A-4, B-1, C-3, D-2.

Answer: A-4, B-1, C-3, D-2

Observe the given diagram of a genetic cross and match the labels...