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Biology

2. Why selection should come first before breeding is done?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter21: Microevolution: Genetic Changes Within Populations

Section21.5: Adaptation And Evolutionary Constraints

Problem 1SB: How can a biologist test whether a trait is adaptive?

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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…
1. In animal breeding, what do you mean by selection
How can a biologist test whether a trait is adaptive?
15. 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.
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 Which of the following would be a good argument for supporters of selective breeding? A Selective breeding provides surprising results B Selective breeding can pass on harmful traits to offspring C Selective breeding increases genetic variation D Selective breeding produces offspring with desired traits
2. Do you think the government should or should not fund scientific researches on changing the genes of unborn babies that aims to improve their characteristics such as intelligence or physical traits such as athletic ability or appearance? Feedback What does the pícture show?
8. Give an example of a positive effect of selective breeding. (It can be ascertained from the article, our lesson, or the supplemental videos)
1. Given that there's a science to back you up and you actually have the capability of producing an offspring with your desired traits, would you do it? What should the limitations be if you have to put a limit on this? 2. On the other hand, give some reasons why you will not choose to do it even if there's a science to back you up and you actually have the capability of producing an offspring with your desired traits.
2. What are alleles?
7. discuss the role environment plays on phenotypes
3. 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).