Bio 210 HW4 Name This is based mostly on lecture and pages 204-209 in chapter 7,
ID: 191313 • Letter: B
Question
Bio 210 HW4 Name This is based mostly on lecture and pages 204-209 in chapter 7, read pages 204-209 and be able to answer multiple choice questions 1,2 and 6. Most of these are questions you did not answer last week. 1·The heritability of a trait describes (a) the proportion of phenotypic variation in the population that is due to genetic differences between individuals (b) whether selection on a trait will result in evolutionary change (c) the proportion of an individual's phenotype that is due to its genotype (d) a and b are correct (e) a, b, and c are all correct 2. A trait with heritability = 0: (a)must have no genetic basis (b)means that most of the phenotypic variation in the population is explained by differences in the alleles that individuals have (c)means that there is no phenotypic variation (d)means that the phenotypic variation in the population is explained by differences in the environments experienced by individuals e. a and d are correct 3. Height is a quantitative trait meaning that genes at several loci contribute to the phenotype Does this mean that any two individuals in a population that differ in height also differ in the alleles the y carry? Briefly explainExplanation / Answer
1. Answer: D) a, b and c are all correct.
Heritability Is defined as the proportion of phenotypic variation in the population that is due to genetic differences between individuals. also, the portion of variation in a phenotype that is affected as a result of genetic variation, is identified. Also, when there is an increase in phenotypic variation in an individual, there would be an increase in heritability, which would imply that there will be variation among individuals, thus leading to evolution.
2. Answer: A and D are correct.
When there is 0 heritability, it would mean that the phenotypic variation does not have any genetic reasons. For example in identical twins, where heritability is 0, as the genetic differences are not the reason of phenotypic variations. Phenotypic variations are as a result of the environmental interactions that take place.
3. Not necessarily. Two individuals having the different height can have similar genetic make up. Since height is a quantitative trait and genes at many loci contribute in its formation, it would mean that there more factors, and not only genes that would contribute to the formation of height and its differences. Again, taking the examples of identical twins, there have been cases where identical twins have differences in heights. One of them differs from the other by at least an inch or so. Considering that identical twins have almost similar genetic make up, the difference in height would not be as a result of genetic differences but the environment.
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