A researcher sets up an experimental breeding cross in Drosophila. She wants to

Question

A researcher sets up an experimental breeding cross in Drosophila. She wants to test if there is linkage between genes A, D, and Z. A controls eye color, B controls the rate of reproduction, and Z also controls eye color. Gene A has three versions, D has four, and Z has three. How many total traits are involved in this cross? How many total alleles are involved in this cross? How many total genes are involved in this cross? It is thought that in lab mice, hyperactive behaviour is caused by a single recessive allele of a single gene. In order to test this, crossings between heterozygous parents were conducted. Among 75 offspring, about how many individuals would you expect to be hyperactive if this prediction is true? After matings produced 75 offspring, 27 of them were observed to have hyperactive behavior; the other 48 offspring were behaviorally normal. Use a chi^2 test (with 1 degree of

Explanation / Answer

5. Eye color and rate of reproduction are two traits involved in the cross. Genes A and Z control eye color and gene D controls rate of reproduction.

6. Number of allele involved:

A contains 3 versions, D contains 4 versions and Z contains 3 versions. Therefore, number of alleles = 3 + 4 + 3 = 10

7. Total genes are 3 A, D and Z. Genes A and Z control eye color and gene D controls rate of reproduction.

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