10. A moth has three alleles at a locus that controls antenna color: X,, X2 and

Question

10. A moth has three alleles at a locus that controls antenna color: X,, X2 and X3. X1 is dominant to X2 and Xsi X1 produces red antennae. X2 is co-dominant to Xa; X2X2 produces yellow antennae, XX produces white antennae, and X2X, produces light yellow antennae. The phenotypic frequencies in a population are as follows: 0.16 wHITE 0.16 LIGHT YELLOw 0.04 YELLOW 0.64 RED 2. Assume that this population is in Hardy-Weinberg equilibrium: what is the frequency of the X2 allele i this population? a) 0.04 byo.20 c)0.40 d) 0.32 e) 0.64 11, Keep assuming that the population described in Question #10 is in Hardy-Weinberg equilibrium what is the frequency of the X1 allele in this population? a) 0.4 b) 0.64 c) 0.642 d) V0.64 e) There's not enough information to figure this out

Explanation / Answer

According to Hardy weinberg equation under specific conditions the frequencies of the allele in the gene in a given population remain constant. Thus according to this frequencies of allele and genotype will remain same through the generation unless there will be no evolutionary influence.

It help us to predict the genotype frequencies in large population.

If there are two allele having allelic frequencies p and q and we know eqution of probability and frequencies add to 1

p2+2pq+q2=1

10. The X3X3 genome produces white antennae. Now Phenotypic frequency of the white antennae is 0.16 or 0.04 in whole population. Hence frequency of X3 should be square root of 0.04 i.e, 0.20.

Hence the correct option is (B) ) 0.20

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