Genetic distance between markers:单项选择题

A

Is a calculation of the distance in centimetres between markers

B

Can only be calculated using a backcross population

C

Is an estimate based on the frequency of recombination between two loci

D

Is a measure of how many base pairs there are between marker loci

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Two genes are 18 map units apart. In a testcross, what percentage of offspring is expected to be recombinant?

Question at position 10 Suppose the map for a particular human chromosome interval is: a——1 m.u.——b——1 m.u.——c——1 m.u.——d——1 m.u.——e——1 m.u.——f In a man heterozygous for all six genes, what fraction of his sperm would be recombinant in the a–f interval? cannot be determined0%1%5%2.5%

Recombination frequencies are useful in developing genetic maps. Genetic maps provide the relative locations of genes on a chromosome. The table below shows recombination frequencies for specific gene pairs. This information was used to generate the genetic map on the right. What is the recombination frequency between Genes A and D with these data: out of the 200 total progeny, 40 are recombinant progeny? Enter your answer as a number. Recombination Frequency between Genes A and D: [Fill in the blank], % Based on your calculation above, use the genetic map to determine the recombination frequency between Genes B and A. Enter your answer as a number. Recombination Frequency between Genes B and A: [Fill in the blank], %

Recombination frequencies are useful in developing genetic maps. Genetic maps provide the relative locations of genes on a chromosome. The table below shows recombination frequencies for specific gene pairs. This information was used to generate the genetic map on the right. What is the recombination frequency between Genes A and D with these data: out of the 200 total progeny, 40 are recombinant progeny? Enter your answer as a number. Recombination Frequency between Genes A and D: [Fill in the blank], % Based on your calculation above, use the genetic map to determine the recombination frequency between Genes B and A. Enter your answer as a number. Recombination Frequency between Genes B and A: [Fill in the blank], %

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