Question

You are provided the following recombination frequencies for four traits determined by four genes on one chromosome in corn (Zea mays). Based on this information, organize the genes in a way that represents their arrangement on the chromosome.

dotted—yellow seedlings 7.3 mu

bronze color—yellow seedlings 25 mu

dotted—kernel color 26 mu

kernel color—bronze color 4.8 mu

dotted—bronze color 31.1 mu

(3 pts) You are doing a genetics experiment with fruit flies. In the “P” generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. In the following questions, please indicate the alleles associated with dominant phenotypes by uppercase letters and alleles associated with recessive phenotypes by lowercase letters. Assume the genes are not found on a sex chromosome. Indicate the color alleles as “B” and “b” the wing alleles by the letters “N” and “n”.

A. What are the genotypes of the flies in the P generation and the F1 generation?

B. You now take an F1 female and cross her to a true-breeding black, wingless male. What is the genotype of this male?

C. You count 1600 offspring from this cross. If the wing and the color traits were not linked and no recombination occurred, what numbers of different offspring phenotypes would you expect?

D. Instead, you observe the following ratios: 85 brown winged flies 728 black winged flies 712 brown wingless flies 75 black wingless flies Use a chi-square test to determine if these ratios fit a model of independent assortment of two genes in dihybrid parents. For full credit, include your null hypothesis, X2 value, P value and whether or not your null hypothesis is supported.

E. Now, assume the genes are linked (regardless of your answer in part D). How many mu apart are they?

Answer 1

The answer for

You are provided the following recombination frequencies for four traits determined by four genes on one chromosome in corn (Zea mays). Based on this information, organize the genes in a way that represents their arrangement on the chromosome.

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