hello please answer these questions for me Table 1.2: Frequency of each allele a
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hello please answer these questions for me
Table 1.2: Frequency of each allele and genotype in the classroom population. Dominant Recessive Dominant Phenotype Recessive Phenotype allele allele Trait 2pq homozygous heterozygous homozygous dominant recessive Tongue rolling Earlobe Thumb Hair line 0.5 48 00 0.50 0.88 0.0 loa lo 73-1007310,31-let-o.5 Finger hair Questions 1. In your classroom population for most traits, were there more students with the dominant phenotype or the recessive phenotype? Was there an instance where there were more students with the dominant phenotype BUT at the same time there were more recessive alleles in the population (q was larger than p)? 2. 3. Explain how this is possible.Explanation / Answer
Frequency for dominant phenotype is given by p2 and 2pq and frequency of recessive phenotype is given by q2.
For tongue rolling traits : Frequency of dominant phenotype ( p2 + 2pq) = 0.45 which greater than frequency of recessive phenotype of 0.27
For earlobe trait: Frequency of dominant phenotype = 0.77 greater than frequency of recessive phenotype (0.230)
For thumb trait: Frequency of dominant phenotype = 0.224 less than frequency of recessive phenotype (0.77)
For hairline trait: Frequency of dominant phenotype = 0.19 less than frequency of recessive phenotype (0.81)
For finger hair trait: Frequency of dominant phenotype = 0.463 less than frequency of recessive phenotype (0.54)
The freqency of 3 recessive phenotype is greater than their dominant counterparts. So students with recessive phenotype are more in number.
2. This may be due to higher population of heterozygotes. They have Aa genotype as they carry both dominant and recessive alleles. For calculation of recessive allele frequency (q) the heterozygous population is also taken into consideration. However heterozygotes only have the dominant phenotype. Therefore despite having a higher frequency , a recessive allele can be masked by the presence of dominant allele in the heterozygotes to produce a dominant phenotype.
This can be seen in the case of tongue rolling trait where frequency of recessive allele q = 0.52 is greater than p= 0.48 but the frequency of people with dominant phenotype (0.45) is way more than frequency of recessiv phenotype (0.27)
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