Which of the following statements is true?

A.) Recombination of the body color and red/cinnabar eye alleles will occur more frequently than recombination of the alleles for wing length and aristae length.

B.) Recombination of the body color and aristae length alleles will occur more frequently than recombination of red/brown eye alleles and the aristae length alleles.

C.) Recombination of the gray/black body color and long/short aristae alleles will not occur.

D.) Recombination of the red/brown eye and long/short aristae alleles will occur more frequently than recombination of the alleles for wing length and body color.

The statement which is true among the given statements is:

D.)  For wing length and body color of the alleles than the recombination of the red/brown eye and long/short aristae alleles will occur more frequently.

Explanation:

When a chromosomal map is made,it was assumed that they appear like on a thread like structure. It was also seen that their is a  recombination between two chromosomes that are homologous and can take place with equal atmosphere anywhere along the chromosome on length wise.

 These observations can also be seen like it is concluded that,  a chromosome were dissociating more likely during meiosis  for the reason recombination could occur on a large region where there are alleles.  Inversely, the chromosome which were closer to the alleles were likely to be inherited together.

the number of crossovers between the provided two alleles

their genetic distance from one another is getting correlated on that chromosome relatively I.E. their recombinational frequency.

Considering AaBb and aabb Their crossovers above,

 recombination frequency=  50/1000 = 0.05.

i.e. genes crossover of  A/a and B/b was 0.05, or 5 percent.

Such a result indicates their is definitely a link between, difference was between their crossovers.

Now, genetic map had been divided into map units

or centimorgans (cM), in which a  frequency of recombination

0.01 will correspond to 1 cM.

Therefore, the right option is:

D.)  For wing length and body color of the alleles than the recombination of the red/brown eye and long/short aristae alleles will occur more frequently.

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i hope this you! : )