The Galapagos Islands are home to a unique iguana species that dives for extended periods of time to feed on algae from the sea floor. This makes them the world's only marine lizard. Assume the scales of these iguanas exhibit two phenotypes controlled by a single gene with two alleles: dominant, brown (G) and recessive, green (g). After studying the population for many years, a group of scientists concluded that a mess of 10,000 iguanas was not evolving, and that this mess contained 30% brown alleles and 70% green alleles. a) What is the expected frequency of each genotype for scale color? b) What is the expected number of individuals with each phenotype? Much to the researchers' dismay, one year during an EI Niño cycle, food became scarce and the mess of iguanas was randomly reduced to 100 individuals: 75 brown and 25 green. The researchers then conducted a genetic study on these individuals and found that of the 75 brown individuals, 30 were heterozygous. c) What is the actual frequency of each genotype in the reduced population? d) What is the actual frequency of each allele in the reduced population?

You are examining population genetics of aquatic iguanas that live on the Galapagos islands. When you go to visit, you notice that the iguanas can easily swim to close neighboring islands but would have swim very long distances to reach further islands.  Which of the following statements is a likely conclusion from your research?   a. Populations are less similar the closer the islands are to each other.   b. The further the islands likely have the greatest genetic diversity.   c. Larger islands always have the lowest heterozygosity.   d. Smaller populations on very small islands exhibit greater population differentiation.

After graduation, you and 19 of your closest friends charter a plane to go on a round-the-world tour. Unfortunately, you all crash land safely on a deserted island and you start a new population totally isolated from the rest of the world. Two of your friends are heterozygous for the recessive cystic fibrosis allele (c). Assuming that the frequency of this allele does not change as the population grows, what will be the incidence of cystic fibrosis on your island?  In percentage provide summation.

You are examining a population of snakes in which 20% of the individuals exhibit the recessive phenotype for albinism. If albinism is exhibited only by the genotype aa, how many snakes out of a population of 100 would you expect to CARRY the albinism allele (so be Aa), but be normal color?

Hitchhikers thumb is a recessive trait. We'll use: H=non-hitchhikers thumb allele and h=hitchhikers thumb allele. If the conditions in the previous question hold: people without hitchhiker's thumbs find people with hitchhiker's thumbs sexy and vice versa - (the Vive la diference theory-haha). This preference leads to non-random mating in a population that starts out in Hardy-Weinberg equilibrium, and no evolutionary forces act on the population. What will happen to the frequency of the hitchhiker's allele (h) in the next generation? O It will stay the same. O The frequency of the hitchhiker's allele (h) will increase in the next generation. O The frequency of the hitchhiker's allele (h) will decrease in the next generation.

In a populationof manatees, short whiskers are recessive to long whiskers. There are estimated to be only 4387 manatee left in the world. Of these, 827 have short whiskers. What is the frequency of homozygous recessive individuals?

In mice, albinism (g) is recessive to grey coat colour (G). The fur colour in mice is a single gene trait controlled by two alleles.In an ideal mouse population exhibiting Hardy–Weinberg equilibrium, a grey mouse mated with an albino mouse. Over the course of several months, 55 pups were born.If the grey allele has a frequency of 0.618, which of the following rows identifies the number of the grey and albino alleles in the population of 55 pups? Group of answer choices Grey Allele Albino Allele 34 21 Grey Allele Albino Allele 68 42 Grey Allele Albino Allele 42 68 Grey Allele Albino Allele 21 34

The loss of genetic variability within populations is an important concern for conservation biologists when trying to conserve a species whose numbers have been greatly reduced due to loss of habitat.  This is true for the example of the Bengal Tiger, Clemson’s mascot.  This reduction of genetic variability in small populations affects their evolutionary potential.  Which of the following are NOT potential  consequences of the loss of genetic variability for tiger populations? A. Increased homozygosity can lead to the expression of deleterious recessive alleles B. Increases the ability of the population to adapt to changes in the environment C. Decreases the probability that the population can withstand a disease outbreak D. Increases the risk of extinction for the population

In New Zealand you begin to study the relationship between snails and their trematode parasites.  You found that the parasites cause cyclical patterns of selection on the snail populations, and vice a versa, such that snails with rare genotypes typically survive better compared to those that have more common genotypes.  In the ten years you’ve been sampling, you notice that the two alleles cycle between being rare and common from year to year. What pattern of selection did you observe?   a. selection against the dominant allele   b. selection against the recessive allele   c. frequency-dependent selection   d. overdominance

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