In Drosophila,the Allele Red Eyes (Bw+)is Dominant to the Allele

Multiple Choice

In Drosophila,the allele red eyes (bw+) is dominant to the allele for brown eyes (bw) .At another gene locus on the same chromosome,the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv) .Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F₁ progeny.
-What is the relationship between recombination frequency and the actual physical distance on a chromosome?

A) As physical distance increases,the recombination frequency increases in a linear fashion.
B) As physical distance increases,the recombination frequency decreases in a linear fashion.
C) As physical distance increases,the recombination frequency first increases in a linear fashion,but gradually levels off to a frequency of 0.5.
D) As physical distance increases,the recombination frequency first increases,but then decreases.