In tomato plants (Solanum lycopersicum), the gene for stem hairiness has alleles HHH (hairy) and hhh (hairless), while the gene for stem colour has alleles PPP (purple) and ppp (green). These two genes are autosomally linked, as shown in the diagram below.
A testcross was carried out by crossing a heterozygous hairy, purple-stemmed tomato plant (HhPpHhPpHhPp) with a hairless, green-stemmed tomato plant (hhpphhpphhpp).
The phenotypes and numbers of the 1600 offspring resulting from this cross were:
- Hairy, purple stem: 692
- Hairless, green stem: 708
- Hairy, green stem: 104
- Hairless, purple stem: 96
What is the recombination frequency (crossover frequency) between the gene for stem hairiness and the gene for stem colour?
6.0%6.0\%6.0%
12.5%12.5\%12.5%
25.0%25.0\%25.0%
87.5%87.5\%87.5%