Gce Model Questions Vol1 2018 Biology Question 31

Practice objective / multiple choice question 31 from the 2018 Gce Model Questions Vol1 Biology examination.

Gce Model Questions Vol1 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 31 GCE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

A pea plant of unknown genotype for height (T tall, t dwarf) and seed shape (S smooth, s wrinkled) is test‑crossed with a plant homozygous recessive tt ss. From 200 offspring the following phenotypes are recorded: 120 tall smooth, 30 tall wrinkled, 28 dwarf smooth and 22 dwarf wrinkled. Identify the genotype of the unknown parent and calculate the recombination frequency between the two genes.

Answer Options

A. The unknown parent is heterozygous Tt Ss and the genes are linked with a recombination frequency of 15%.
Correct Answer B. The unknown parent is heterozygous Tt Ss and the genes are linked with a recombination frequency of 29%.
C. The unknown parent is homozygous dominant TT SS and the genes are linked with a recombination frequency of 29%.
D. The unknown parent is heterozygous Tt Ss and the genes are unlinked with a recombination frequency of 50%.
Correct Answer
B
Correct Option:
The unknown parent is heterozygous Tt Ss and the genes are linked with a recombination frequency of 29%.

About This Question

This is Gce Model Questions Vol1 2018 Biology Question 31. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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