DP Biology (first assessment 2025)

Test builder »

Question 23M.1A.SL.TZ2.32

Select a Test
Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ2.32
Level SL Paper 1A Time zone TZ2
Command term Question number 32 Adapted from N/A
32.
[Maximum mark: 1]
23M.1A.SL.TZ2.32

In the fruit fly Drosophila, the alleles for red eyes and brown bodies are dominant to the alleles for white eyes and yellow bodies. Which cross would be suitable to determine whether the genes are linked?

A.  Heterozygous red-eyed flies crossed with yellow-bodied flies

B.  White-eyed flies crossed with homozygous brown-bodied flies

C.  Homozygous red-eyed, brown-bodied flies crossed with white-eyed, yellow-bodied flies

D.  Heterozygous red-eyed, brown-bodied flies crossed with white-eyed, yellow-bodied flies

[1]

Markscheme

D

Syllabus sections