In a hypothetical population of 2500 people, 2275 people have brown eyes and 225 people have blue eyes (the homozygous-recessive phenotype). If there are 4000 children produced by this generation, how many (i.e., what number) of the children would be expected to be heterozygous for eye color?

Assume that long ear lobes in humans are an autosomal dominant trait that exhibits 30% penetrance. A person who is heterozygous for long ear lobes mates with a person who is homozygous for normal ear lobes. What is the probability that their first child will have long ear lobes?

Farah breeds and sells true-breeding black salamanders.  At a salamander convention, she purchased a single red salamander from a breeder who told her the red color was an autosomal recessive trait. Describe a breeding program Farah could use to establish a strain of all red salamanders to sell. Include the phenotypic and genotypic ratios of offspring in each generation (F1, F2, etc.). You may assume that Farah can get hundreds of offspring from each mated pair, and that it's ethically okay for sibling salamanders to mate.

Tay-Sachs disease is a recessive genetic disease. Individuals with this disease rarely survive past the age of four. In the general population, approximately 1 person in 300 carries the allele for this disease. However, in some populations, including the Irish Americans, the Ashkenazi Jews, and the Cajuns from Louisiana, the proportion of Tay-Sachs carriers is much higher (1 in 27 to 1 in 50) than in other populations. Such high frequency of an otherwise rare allele is expected when    Question 24 options:   populations experienced disruptive selection   populations were founded by a small number of settlers   the allele is advantageous at the heterozygous state    populations have higher than average mutation rates   populations experienced stabilizing selection

On an island in the Pacific Ocean, there is a species of birds with different sized beaks, with one specific gene determining their beak size. Birds who are homozygous dominant (BB) or heterozygous (Bb) for this particular gene have small beaks, while birds who are homozygous recessive (bb) for this particular gene have big beaks. For each combination of parents below, predict the frequency with which each phenotype and genotype exists. Make sure to include gametes from each parent. 1) Homozygous Dominant ( BB ) x Homozygous Dominant ( bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Hint, do your percentages above add up to 100%? 2) Homozygous Recessive ( bb ) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb 3) Heterozygous ( Bb) x Heterozygous ( Bb ) Genotypes: Phenotypes: BB Big Beaks Bb Small Beaks Bb Review: What were all the alleles used above? How many possible genotypes do you expect to find within this species, for beak size?

In a human population at equilibrium, three genotypes are present in the following proportions:       A/A = 0.81, A/a = 0.18, a/a = 0.01.  Answer the following questions: What are the frequencies of gene A and gene a? What will their frequencies be in the next generation? What proportion of all marriages in this population is between heterozygotic parents?

In a hypothetical situation, brachydactyly is caused by a recessive allele (b). If a woman who is heterozygote with normal fingers (Nb) and a man with brachydactyly (bb) have children, what proportion of these children would you expect to have normal fingers? (You may want to draw the punnett square on a scrap piece of paper). Group of answer choices A-50% B-0% C-75% D-100% E-25%

Snow geese (Chen caerulescens) come in two color types, white “snows” and “blues” with dark bodies. A single gene controls coloration, where the dark (“blue”) allele (D) is dominant. A population of 30,012 geese includes 9236 dark individuals. Genetic testing reveals that 7636 of the 9236 dark individuals are heterozygous (Dd). According to the Hardy-Weinberg equilibrium, what is the expected frequency of genotype Dd? Group of answer choices A.) 0.492 B.) 0.181 C.) 0.297 D.) 0.453

In some populations of grasses, the ability to grow in soil sprayed with a certain herbicide is a dominant trait determined by the allele "R". In a population at genetic equilibrium, 91% of the seeds can germinate in sprayed soil. What are the frequencies of "R" and "r"? What percentage of the plant that germinates in the soil will be heterozygotes?

Color blindness is typically an inherited genetic condition in which individuals have a decreased ability to see color or differences in color. Color blindness only occurs in individuals who have two recessive alleles for the condition. Normal color vision is due to a dominant allele (C) Color blindness is due to the recessive allele (c) a) If Susan is homozygous for normal vision, and Matt is homozygous for color blindness, what is the likelihood (in percentage) that their son Alex will have color blindness? Perform a Punnett Square (either below or by hand on paper) to find the probability. Provide your answer in a full sentence. If you did the Punnett Square by hand, attach your photo to the next question.