Neco Model Questions Vol1 2019 Biology Question 23

Practice objective / multiple choice question 23 from the 2019 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 23 NECO_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

In *Drosophila*, genes \(A\) and \(B\) are linked on the same chromosome with a recombination frequency of \(10\%\). A heterozygote with the cis arrangement \(AB/ab\) is test‑crossed with a homozygous recessive \(aabb\). (i) What phenotypic ratio is expected among the progeny? (ii) If 200 progeny are obtained, how many are expected to be recombinants?

Answer Options

A. Phenotypic ratio 9:9:2:2; 30 recombinant offspring out of 200
Correct Answer B. Phenotypic ratio 9:9:1:1; 20 recombinant offspring out of 200
C. Phenotypic ratio 9:9:1:1; 10 recombinant offspring out of 200
D. Phenotypic ratio 8:8:1:1; 15 recombinant offspring out of 200
Correct Answer
B
Correct Option:
Phenotypic ratio 9:9:1:1; 20 recombinant offspring out of 200

About This Question

This is Neco Model Questions Vol1 2019 Biology Question 23. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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