NEET Botany — MCQ Practice Questions & Answers

Question 1

A man with hemophilia (XʰY) marries a normal woman (XʰXʰ). All their daughters will be _______ and all sons will be _______.

Accepted Answer

Correct answer: C. Carriers; normal — Cross: XʰY × XʰXʰ produces XʰXʰ (carrier daughters) and XʰY (normal sons). Daughters carry one recessive allele but are phenotypically normal.

Answer

A. Carriers; affected

Answer

B. Affected; normal

Answer

D. Normal; affected

Question 2

In Drosophila, white eye color (w) is recessive to red eye color (w⁺) and is X-linked. If a white-eyed female is crossed with a red-eyed male, what will be the eye color of the F1 females?

Accepted Answer

Correct answer: B. Red — Cross: ww × w⁺Y produces w⁺w (heterozygous females with red eyes) and wY (white-eyed males). F1 females are red-eyed.

Answer

A. White

Answer

C. Pink

Answer

D. White and red

Question 3

A cross between a plant with genotype AaBb and a plant with genotype aabb produces 160 offspring. Due to linkage between genes A and B (20 map units apart), the expected frequency of AaBb offspring will be approximately ______.

Accepted Answer

Correct answer: C. 40 — With 20 map units distance, recombination frequency is 20%. Parental types (AB/ab) = 40% each, recombinants = 10% each. AaBb from coupling = 40 out of 160.

Answer

A. 10

Answer

B. 20

Answer

D. 80

NEET Botany - MCQ Practice Questions