Forces are always acting on the genes of a population, causing natural selection to occur. Describe the forces that affect the genes in a population. Use details to support your answer.

You have a population of flies in a tank in your lab.  The population is in Hardy-Weinberg equilibrium for a gene that codes for wing shape.  The dominant form of the wing shape gene is “W”.  The recessive form of the wing shape gene is “w”.  Flies that are homozygous recessive for the wing shape gene have very short wings; heterozygous and homozygous dominant individuals have long wings. You have a total population of 900 flies; 150 of those flies have very short wings.   The frequency of the w allele in the population of flies described above is _______. Group of answer choices 0.01 0.09 0.60 0.91 0.41

There are particular factors that cause the diversity in a gene pool to change. For each of the following statements, select the correct factor from the menu on the attached picture that is being described. The process by which organisms with certain heritable traits survive, passing on their traits to the next generation; determined by the environmental conditions of the time    A change in allele frequencies caused by chance events in a small gene pool  The movement of alleles into or out of a population by immigration or emigration  The process of choosing mates based on the presence of certain traits or phenotypes and, thus, genotypes; traits are usually displayed in some form of courtship ritual   A type of genetic drift that occurs when a natural disaster thins the population to a small group that happens to be unrepresentative of the original group; allele frequencies of the two groups will be dissimilar   A type of genetic drift that occurs when a small population that is not…

The table below records information on a gene with two alleles, Z and Y, in four different populations. Use this information to answer the following questions. Based on the table, which of the following statements is true? Population Frequency of allele Z Population size Fitness of ZZ Fitness of ZY Fitness of YY A 1.0 200 0.84 0.84 1.0 B 0 320,000 0.84 0.84 1.0 C 0.93 130,000 0.84 0.84 1.0 D 0.99 1,450,000 1.0 1.0 0.62 A.) populations C's allele frequencies are mainly driven by genetic drift B.) Mutation rates are high in population D C.) natural selection is favoring allele A in population C D.) migration is occuring between populations C and D

Natural selection is dependent on several factors, including the ability a population to survive and reproduce within a particular environment. How are both of these factors modeled?

You discover that there are 4 alleles for the “w” gene that determines wing shape in flies.  Is this a violation of Hardy-Weinberg model? Group of answer choices Not if one of the alleles is present only in females. Not if the trait is determined by sexual selection. Not if all four alleles are present in the population. Yes, because Hardy-Weinberg can only be applied to genes with 2 alleles. None of the answers shown are correct.

Evolution is driven by both nonrandom and random mechanisms. Identify the mechanisms of evolution that are random and comment on how they affect allele frequencies across generations.

A hypothetical population has two alleles for a “B" gene: B1 and B2. In a random sample of 50 diploid zygotes (for a total of 100 alleles), the following genotypes were found: 20 B1B1, 20 B1B2, and 10 B2B2 The above values represent the initial genotype frequencies of zygotes in the population. Let's say that selection acts against the B2 allele, and all 10 individuals with B2B2 genotype die off before reaching maturity (leaving 0 B2B2 individuals). (The number of surviving adults in the population is 40, so the number of alleles is 80). What is the new observed frequency of the homozygous dominant genotype? O A. 0.10 О В. О.70 O C. 0.25 O D.0.50 O E. 0.75