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3. Is it possible for a recessive trait to be frequently expressed in a population? Why?
4. If a certain type of trait in a family or clan is considered by most people to be “better” or “ideal”, is it
possible to maintain the same type of trait in the succeeding generations? If so, how?
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- 2. A survey was conducted for a certain trait (the ability to roll tongue or inability to roll the tongue) in a population. The result shows that 215 of the respondents can roll their tongue and 85 cannot roll their tongue. The picture below shows a person rolling his tongue. Rolling the tongue into a tube shape is often described as a dominant trait. If the dominant allele is represented by R (can roll tongue) and r represents the recessive allele, calculate the phenotypic frequencies, allele frequencies, the expected numbers of the three genotypic classes and the expected numbers of the two phenotypic classes (assuming random mating). Using chi-square test, determine whether or not this population is in Hardy-Weinberg equilibrium. REMEMBER: Phenotype RR and Rr Can roll tongue Cannot roll tongue Genotype HWE term p2 and 2pq q? rr Again, follow the format below for your answers. Regarding letter "F" on the format, you will show the computations on how you arrive to the chi-square value…4. If a certain type of trait in a family or clan is considered by most people to be “better” or “ideal”, is itpossible to maintain the same type of trait in the succeeding generations? If so, how?4.Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene—an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). The allele for long eyelashes is dominant (L) and the allele for short eyelashes is recessive (l). An individual who is heterozygous for eyelash length would have which of the following genotypes? A.Short eyelashes B.Ll C.LL D.Long eyelashes
- 2 2. A survey was conducted for a certain trait (the ability to roll tongue or inability to roll the tongue) in a population. The result shows that 215 of the respondents can roll their tongue and 85 cannot roll their tongue. The picture below shows a person rolling his tongue. Rolling the tongue into a tube shape is often described as a dominant trait. If the dominant allele is represented by R (can roll tongue) and r represents the recessive allele, calculate the phenotypic frequencies, allele frequencies, the expected numbers of the three genotypic classes and the expected numbers of the two phenotypic classes (assuming random mating). Using chi-square test, determine whether or not this population is in Hardy-Weinberg equilibrium. REMEMBER: Genotype Phenotype Can roll tongue Cannot roll tongue HWE term p2 and 2pq q2 RR and Rr rr15. When populations get very small, harmful alleles may be expressed in individuals more often because: individuals choose mates that are more like themselves. alleles which are harmful have no way of being selected out of the population. because related individuals have a higher likelihood of carrying the same alleles, so more recessive alleles will be expressed. All of these choices are true.1. In our classroom for most traits, were there more students with dominant or recessive phenotype? 2. Was there an instance where there were more students with dominant phenotype but more recessive alleles? (q larger than p?) 3. How is this possible?
- 1. The compound phenylthiocarbamide (PTC) tastes very bitter to most persons. The inability to taste PTC is controlled by a single recessive gene. In the American white population, about 70% can taste PTC while 30% cannot (are non-tasters). Estimate the frequencies of the Taster (T) and nontaster (t) alleles in this population as well as the frequencies of the genotypesImagine that genetic technology advances to the point where the genetic profile of an individual can be easily obtained, and that we have a full understanding of how genes interact to influence our health. Based on this genetic information alone, how reliably do you think we would be able to predict a person's chance of getting a specific disease? Where do you think this type of genetic profiling would lead with respect to selection of offspring or genetic superiority?5. The allele for a hitchhiker's thumb is dominant over a straight thumb. In a population of 1000 Individuals, 510 show the dominant phenotype. How many individuals would you expect for each of the three possible genotypes for this trait.
- 3. For each possible genotype/phenotype, write down the number of alleles of each type: TT/taster: "taster" alleles "non-taster" alleles Tt /taster: "taster" alleles "non-taster" alleles tt/non-taster: "taster" allele "non-taster" alleles3. Choose ONE trait observed in class and explain why one form of the trait is more frequent than the other form of the trait (i.e. why the dominant form is more frequent than the recessive form or vis-à-vis).6. In a population of mice, coat color is controlled by a single additive locus. BB mice are black, bb mice are white, and Bb mice are grey. The population is currently in HWE, with 1% of the mice having the white phenotype. Grey mice have twice as many offspring as black or white mice. What will be the frequency of the b allele in the next generation? The answer is supposed to be 0.16, can you explain how to get to this?