GENETICS Compulsive channel switching (i.e. channel surfing) is found to be caus
ID: 54483 • Letter: G
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 the woman described above will produce a gamete containing the alleles cs+ fba+ bp?
Explanation / Answer
A normal female has the genotype cs+fba bp+ /cs fba+bp.
Total number of gametes produced by the female= 2n ,where n=number of genes.
So, Total number of gametes produced by the female= 23 = 8
probability that the woman described above will produce a gamete containing the alleles cs+ fba+ bp = 1/8
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