GENETICS Compulsive channel switching (i.e. channel surfing) is found to be caus

Question

GENETICS

Compulsive channel switching (i.e. channel surfing) is found to be caused by a recessive (but highly prevalent) gene on the X chromosome (cs). Also located on the X chromosome are two other recessive genes - one that causes an addiction to watching football on TV (fba), and one that causes excessive burping in public (bp). The location of these genes on the X chromosome are 25 (cs/ cs+), 43 (fba/fba+) and 76 (bp/bp+) map units. The level of interference over this linkage group (i.e. the Coefficient of Interference) is 0.15. A normal female has the genotype cs+fba bp+ / cs fba+bp. What is the probability that she will produce a gamete that contains all three recessive alleles?

What is the probability that the woman described above will produce a gamete containing the alleles cs+ fba+ bp?

A) 0.065

B) 0.09

C) 0.13

D) 0.18

Explanation / Answer

The crossing of cs+ fba bp+ with cs fba+ bp would form 8 combinations. From which, the desired combination of cs+ fba+ bp will be one among them. This means 1/8 = 0.125 or 0.13 probability to be produced in the gametes.

The different combinations are as follow: The desired combination is highlighted in bold.

Sl. No. Combinations 1 cs+ fba+ bp+ 2 cs+ fba+ bp 3 cs+ fba bp 4 cs fba bp 5 cs fba bp+ 6 cs fba+ bp+ 7 cs+ fba bp+ 8 cs fba+ bp

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