GENETICS: question: C. WHAT EVENTS GAVE RIDE TO PROGENY OF CLASS C AND D? D. ON

Question

GENETICS: question: C. WHAT EVENTS GAVE RIDE TO PROGENY OF CLASS C AND D?

D. ON THE BASIS OF THESE EXPERIMENTS, WHAT IS TE GENETIC DISTANCE BETWEEN Y AND SPL?

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11. The partially recessive, X-linked z' mut Drosophila gene zeste (2) can produce a yellow eye color only in flies that have two or mo the wild-type white (w) gene. Using this tandem duplications of the w gene called wroperty identified. Males with the genotype 2 w/Y thus have zeste eyes. These males were crossed to femal the genotype yz' w" spl ly z' w spl". (These fo genes are closely linked on the X chromosome order given in the genotype, with the centrom the right of all these genes: y yellow bodies; y' - tan bodies; spl = split bristles; spl+ = normal bristles.) Out of 81,540 male progeny of these females, the following exceptions were found: 1 were wit t+ R , in the ere to Class A Class B Class C Class D 2430 yellow bodies, zeste eyes, wild-type bristles 2394 tan bodies, zeste eyes, split bristles 23 yellow bodies, wild-type eyes, wild-type bristles 22 tan bodies, wild-type eyes, split bristles

Explanation / Answer

Class C and Class D is the result of recombination or crossing over. Due to crossing over the genes present on the same chromosome gives recombinant combination with recombination frequencies 0% to 50%.

Recombination tends to occur with increasing frequency as the distance between two specific gene increases, the percentage of recombination can be used to measure the distance between the two genes.

Map distance = (number of recombinants/ Total number of offspring) * 100

Map distance = ((23+22)/ 4869 = 0.009cM

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