Linkage and Recombination — Prelims Questions

In *Drosophila*, the genes for body color (B: grey, b: black) and wing size (V: normal, v: vestigial) are located on the same chromosome. A dihybrid female (BbVv) is test-crossed with a double recessive male (bbvv). The following offspring are obtained: Grey, normal wings: 965; Black, vestigial wings: 944; Grey, vestigial wings: 206; Black, normal wings: 185. What is the recombination frequency between the genes for body color and wing size?

Which of the following statements is INCORRECT regarding linkage?

If the recombination frequency between gene A and gene B is 20%, and between gene B and gene C is 10%, and between gene A and gene C is 30%, what is the most likely order of these genes on the chromosome?

In a test cross involving F1 dihybrid flies, more than 90% of the offspring resembled the parental phenotypes. This would indicate:

What is the maximum possible recombination frequency between two genes, and what does it signify?

Which of the following is NOT a factor that can influence recombination frequency?