Chapter 23: the Evolution of Populations

This equation is used to calculate the genotype frequency, so 1 = 100% of the population.

1) If the frequency of a recessive allele is 30% in a population of 100 people, how many would you predict would be carriers of this allele, but would not express the recessive phenotype?

What observations can you make regarding the gene pool and gene frequency of the surviving individuals?

9. No, because each child's 2 sets of chromosomes are rearranged independently, so that there is an equal probability of all of them having the same genotype (1/2^4, or 1/16) as there is of them having all different ones

Over five trials the average allele frequency with this change in the migration rate is 0.366.

A) Their F1 offspring were 97 wild type quahaug flies. What is the genotype of these F1 flies??

21. Assume that a couple has four children who are all boys. What are the chances their next child will also be a boy? Explain your answer.

Suppose the feather color of a bird is controlled by two alleles, D and d. The D allele results in dark feathers, while the d allele results in lighter feathers.

Apply your understanding of how alleles assort and combine during reproduction to evaluate a scenario involving a monohybrid cross.

Now mate a mutant F1 female fly with a mutant F1 male fly. Out of the 50 F2 progeny, what percentage of flies are wild type and what percentage are mutant

D) Sexual reproduction is more likely to increase genetic variation than is asexual reproduction. E) Only asexual

You are also provided with a heterozygous female, and a homozygous recessive male for a genetic cross. In this particular female, all the dominant alleles are on one chromosome, and the recessive counterparts are on the other homologous chromosome. Due to a chromosomal condition, in the female no recombination occurs between the M and N loci. Normal recombination occurs between the L and M loci. Diagram this cross, and show the genotypes and frequencies of all offspring expected from this cross.

Using the Hardy-Weinberg equation, calculate the predicted genotype frequencies for each population scenario below. Place your calculations and data in the space provided below. Once you have calculated the frequencies, answer the conclusion questions for each one. Please remember that all calculations must be shown for full credit.

Based on your results for the female offspring, predict whether color blindness is a dominant or recessive trait. Explain your reasoning.

In a population you will have a portion of alleles that will be categorized by letters for example p has an allele of A1. Then there will be another portion that will be labeled as q which represents the A2 genotype. When these two genotypes mate and reproduce offspring have the potential to have one of the parents genotypes or essentially a combination of their parents genotypes which would look like A1A2. In the big picture the genotypes are recognized as the following A1 A1, A2 A2, or A1 A2. Even though these frequencies don’t change from generation to generation the proportions of the genotype ratio in the populations do change in the generations afterward.