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- 5a) It is generally considered that blue or purplish colored flowers attract bees as pollinators. Red flowers often attract birds such as hummingbirds as pollinators. Is this an example of prezygotic or postzygotic isolating mechanisms? Why? 5b) The graphs in your textbook show that the parental species are partially isolated by living at somewhat different altitudes in the mountains. In nature, the two parental species are also strongly (but not completely) isolated by using different pollinators (bees vs. hummingbirds). Is the presence of altitudinal separation combined with different pollinators likely to give more reproductive isolation in nature compared to each isolating mechanism alone? Why? 5c) Do the figures showing the F2 generation of the flowers suggest that these traits of flower shape and flower color are polygenic or due to single gene loci? Give a reason for your answer. 5d) Looking at the other graphs for this example that are shown in your textbook, is there any…Two parents, who are thought to be different species, mate and produce viable hybrid offspring. When two of these hybrids mate, their offspring are not viable. What is the BEST interpretation of this data? A. The original parents are the same species because they can breed together. B. The original parents are the same species because they can breed together and produce viable offspring. C. The original parents are not the same species because they produce hybrids that impair the species’ development or survival in its environment. D. The original parents are not the same species because they produce hybrids that can have reduced viability and fertility when they mate.27) In the fruit fly speciation experiment, individuals from separate populations that were raised using the same food source were more likely to attempt mating with each other than individuals raised on different food sources. Why? A) Because they had adapted to their environment in the same way B) Because this is an example of allopatric speciation C) Because the separate populations were able to carry out some gene flow D)Because the jars were accidently placed next to each other so the males and females were able to recognize each 28) What is needed for natural selection to occur? A) Variation sexual reproduction, competition B) Variation, heritability competition C)Variation, competition, time D) Heritability, competition, sexual reproduction
- Among a large population of 2 million gray mosquitoes, one mosquito is heterozygous for a body color gene; this mosquito has one gray allele and one blue allele. There is no selective advantage or disadvantage between gray and blue body color. All of the other mosquitoes carry two copies of the gray allele. A. What is the probability of fixation of the blue allele? B. If fixation happens to occur, how many generations is it likely to take? C. Qualitatively, how would the answers to parts A and B be affected if the blue allele conferred a slight survival advantage?About 7% of men in a population are red-green colour blind due to a sex-linked recessive gene. Assuming random mating in the population with respect to colour blindness. a) What percentage of women would be expected to be colour blind? b) What percentage of women would be expected to be heterozygous? c) What percentage of men would be colour blind in the next generation?3. a. Why are most populations not in Hardy Weinberg Equilibrium? b. There is an ancient village population of humans. We know very little about this population. How can we use genetics to determine if the societal system of the village was matrilocal or patrilocal? c. There was variation in a rat phenotype (coat color.) The coat colors ranged from dark color coats to light color coats. As the rats migrated into the basements of campus, the light color rats were more likely to be caught by the campus cat. Over time, the basement rat population shifted to entirely dark color coats. This is an example of what kind of selection? d. Explain how a genetic bottleneck could lead to higher susceptibility of a disease, such cancer, in that population.
- In many zoos, artificial insemination of female tigers is becoming common practice. Semen is collected from male tigers in various zoos around the world.frozen in liquid nitrogen, and shipped to zoos where it is used to inseminate female tigers in estrus a) Why do you think this is being done and how will it affect the population? b) Do you think these effeorts are enough to prevent a genetic bottleneck from occuring? c) what conditions do you think are nessesary to ensure the genetic diversity of zoo populations?If two closely related organisms mate successfully to produce an offspring that is infertile or sterile, how would you classify the parent organisms? They are a) Different species b) Members of the same species c) practicing recombination d) undergoing genetic drift and natural selectiona. What are the various types of reproductive isolating mechanisms that can lead to speciation? b. What are the different modes of speciation? c. Explain how evolution produce the tremendous amount of diversity among organisms.
- 1.A small group of turtles float on a log to an island and establish a new population there. How do you expect the genetic diversity of the island turtles to compare to genetic diversity of the mainland turtle population they originated from? Group of answer choices A. Genetic diversity should be similar, since they are the same species. B. Genetic diversity should be higher for the island turtles, because the new environment will produce new alleles. C. Genetic diversity should be lower for the island turtles, since the island turtles represent a small sample of the genetic diversity from the mainland turtles. 2.If the probability of a turtle having a brown shell is 3/4 and the probability of a turtle having a bumpy shell is 1/4, what is the probability of a turtle that has a shell that is both brown andbumpy? Group of answer choices A. 3/16 B. 3/8 C. 3/4 D. 1/2 3. A Drosophila gene is on the X chromosome, and recessive mutations in this gene cause white eye color…What is the biological definition of a species? A) A group of individuals that can breed and produce viable offspring B) A group of interbreeding individuals that share the same environment C) A group of individuals that share a common ancestor1. In a particular bird species, the tips of the feathers are tinged with blue, white, or silver. The BB genotype calls for blue-tipped feathers. The WW genotype calls for white-tipped feathers. The BW genotype calls for an intermediate with silver-tipped feathers. A mating occurs between a blue-tipped bird and a white-tipped bird. What types of offspring would be expected? Give the genotypes and phenotypes of the possible offspring and the probability of each. 2. The bird species described in question 5 has an ornamental plumage on its head. The plumage feathers are either flexible or stiff. The allele for flexible plumage is dominant over the allele for stiff plumage. A male who is heterozygous for plumage and has silver-tipped wings mates with a female who has stiff plumage with silver-tipped wings. What types of offspring would be expected from this cross? Give the probability of each. 3. In some cats, the gene for tail length shows incomplete dominance. When a cat with a…