Gce Model Questions Vol1 2019 Biology Question 4

Practice objective / multiple choice question 4 from the 2019 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2019 Biology Objective / Multiple Choice Medium Difficulty
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • objective

In pea plants two linked genes are considered: gene \(A\) (tall \(A\) vs dwarf \(a\)) and gene \(B\) (purple flowers \(B\) vs white flowers \(b\)). The parental plant is heterozygous in cis configuration \(AB/ab\) and is test‑crossed with a homozygous recessive \(ab/ab\) plant. The recombination frequency between \(A\) and \(B\) is \(12\%\). Determine the expected phenotypic ratio among the progeny for the four possible phenotypes: tall‑purple, tall‑white, dwarf‑purple and dwarf‑white.

Answer Options

A. 25:25:0:0 (i.e., 50% tall‑purple, 50% dwarf‑white, 0% tall‑white, 0% dwarf‑purple)
Correct Answer B. 22:22:3:3 (i.e., 44% tall‑purple, 44% dwarf‑white, 6% tall‑white, 6% dwarf‑purple)
C. 20:20:5:5 (i.e., 40% tall‑purple, 40% dwarf‑white, 10% tall‑white, 10% dwarf‑purple)
D. 24:24:2:2 (i.e., 48% tall‑purple, 48% dwarf‑white, 4% tall‑white, 4% dwarf‑purple)
Correct Answer
B
Correct Option:
22:22:3:3 (i.e., 44% tall‑purple, 44% dwarf‑white, 6% tall‑white, 6% dwarf‑purple)

About This Question

This is Gce Model Questions Vol1 2019 Biology Question 4. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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