QUESTION 4 In some species of fish, a forked tail fin is dominant to a continuous tail fin. Fish with either fin type swim equally well. The frequency of individuals in a fish farm population that have the continuous tail fin is 49%. Assume the population is in Hardy-Weinberg equilibrium for this trait. What is the frequency of the forked tail allele in this population? O a. 1 O b.0.7 O c. 0.51 Od.0.2 Oe. 0.3

QUESTION 4 In some species of fish, a forked tail fin is dominant to a continuous tail fin. Fish with either fin type swim equally well. The frequency of individuals in a fish farm population that have the continuous tail fin is 49%. Assume the population is in Hardy-Weinberg equilibrium for this trait. What is the frequency of the forked tail allele in this population? O a. 1 O b.0.7 O c. 0.51 Od.0.2 Oe. 0.3

Name: 4 UESTION 3example of a postzygotic reproductive isolating mechanism i
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Description: 4 UESTION 3example of a postzygotic reproductive isolating mechanism isa. Spiders developing elaborate species specifc courtship dances.b. Shoreline birds don't mate with deep forest birds because they occupy different habitats.Oc. The two organisms

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter45: Community Ecology

Section: Chapter Questions

Problem 1DAA: Testing Biological Control Biological control agents are used to battle red imported fire ants....

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(I've asked this question twice, but still haven't gotten a clear answer. I'm still confused on this.) Lions and tigers are separate species. However, on rare occasions (especially in zoos) they have been known to mate and produce hybrid offspring (ligers & tigons!). Explain, with reference to the mechanisms of reproductive isolation, why they are separate species even though they can mate. (1-2 sentences) **Please answer in simple, easily understandable terms**
The difference between sympatric and parapatric speciation is ___. a. parapatric speciation occurs only in worms b. sympatric speciation requires a barrier to gene flow c. the extent of overlap in range d. reproductive isolation does not occur
Two species of fish had recently undergone sympatric speciation. The males of each species had a different coloring through which females could identify and choose a partner from her own species. After some time, pollution made the lake so cloudy it was hard for females to distinguish colors. What might take place in this situation?
Mountain gorillas are a highly endangered primate species, with 800 or so individuals surviving in the two remaining populations. A recent sampling of mountain gorilla genomes revealed a very low level of genetic diversity. Explain why a decline in genetic diversity often accompanies a decline in population size.
The difference between sympatric and parapatric speciation is ___ .a. parapatric speciation occurs only in velvet walking wormsb. sympatric speciation requires a barrier to gene flowc. the extent of overlap in ranged. reproductive isolation does not occur
Males of different species of the fruit fly Drosophilathat live in the same parts of the Hawaiian Islandshave different elaborate courtship rituals. These rituals involvefighting other males and making stylized movements thatattract females. What type of reproductive isolation does thisrepresent?(A) habitat isolation(B) temporal isolation(C) behavioral isolation(D) gametic isolation
A major mechanism of speciation in plants but not in animals isa. adaptation to new environments.b. polyploidy.c. hybrid breakdown.d. genetic changes that alter the organism’s niche.e. both a and d.
Lions and tigers are separate species. However, on rare occasions (especially in zoos) they have been known to mate and produce hybrid offspring (ligers & tigons!). Explain, with reference to the mechanisms of reproductive isolation, why they are separate species even though they can mate.
Testing Biological Control Biological control agents are used to battle red imported fire ants. Researchers have enlisted the help of Thelohania solenopsae, a natural enemy of the ants. This microsporidian (Section 23.4) is a parasite that infects ants and shrinks the ovaries of the colony's egg-producing female (the queen). As a result, a colony dwindles in numbers. Are these biological controls useful against imported fire ants? To find out, USDA scientists treated infested areas with either traditional pesticides or pesticides plus biological controls (both flies and the parasite). The scientists left some plots untreated as controls. FIGURE 45.16 shows the results. FIGURE 45.16 A comparison of two methods of controlling red imported fire ants. The graph shows the numbers of red imported fire ants over a 28-month period. Orange triangles represent untreated control plots. Green circles are plots treated with pesticides alone. Black squares are plots treated with pesticide and biological control agents (parasitoid flies and a microsporidian parasite). How did population size in the control plots change during the first four months of the study?
A biological speciesa. always looks different from other species.b. always has a different chromosome number than other species.c. is reproductively isolated from other species.d. never occupies the same ecological niche as other species.
If these conditions held constant – what would the expected heterozygosity be in thepopulation today (2018 to deal with a clean integer value for generations)?1b. In 1884 the population had grown to 106 when disaster struck the island. Of the 19 adult menon the island, 15 were in the same fishing boat that capsized, leaving only 4 adult men alive onthe island. These desperate times may have changed the sex ratio of the breeding population onthe island. Let’s say that now, each man fathered children with an average of 1.5 differentwomen (male:female ratio of 1:1.5). If we start back with a heterozygosity of 0.5 from this point,given the effective population size on Tristan da Cunha, what is the expected heterozygosity inthe current population 7 generations later?1c. The scenarios described in 1a and 1b are examples of which two evolutionary phenomena,respectively?
Threatened species often have small, isolated populations where mating between relatives occurs. Let's assume one of these threatened species has a disease controlled by a gene that has two alleles A and a. Only individuals with two copies of the "a" allele have the disease and die before reproducing. Question: What are the effects of inbreeding on the frequency of the "a" allele, and the frequency of the disease in the population?