The pesticide DDT was widely used in the 1940s as a method of insect control. In the late 1950s the first DDT-resistant mosquitoes were discovered, and eventually DDT-resistant mosquitoes were found globally. When DDT is used now, the development of DDT resistance in mosquito populations occurs in months rather than years.Which of the following best explains the observations concerning DDT resistance in mosquitoes? * The proportion of DDT-resistant mosquitoes in a population remains constant due to the metabolic costs of DDT utilization DDT is a chemical signal that delays normal reproductive cycles in many mosquito populations. Natural selection favors DDT-resistant mosquitoes that are already present in a population when DDT exposure occurs. Competition for limited resources causes mosquitoes to migrate to geographical areas that have richer supplies of DDT. A population of 1,492 finches is introduced to a rainforest. Over the next year, the finches show a death rate of 0.395 while the population drops to 1,134. What's the birth rate for this population? Is this proving to be a suitable habitat? (Two

The whiptail lizard is an all-female population in which an individual lizard reproduces by cloning itself (by a process called parthenogenesis). Because of this, all surviving whiptail lizards are clones of one another. Which of the following statements is true? I.         The absence of sexual reproduction conserves resources and allows the population to thrive better overall. II.        The absence of sexual reproduction conserves resources but is detrimental to the long-term survival of the species. III.      All members of the population are equally susceptible to parasites and disease. IV.      The population can easily adapt to any environmental change.   A. I only   B. II only   C. IV only   D. II and III

for clarification which is shown in the graph, the darker blue on the bar graph shows the mass(size) of the eggs and the striped blue represents the number of eggs which is also depicted in the graph. as far as the host plants, its just showing 3 different plants the butterflies were on which is represented by the a, b, and c, also located on the graph. The right side of the graph (mass) represents blue and the left side (number of eggs) represents the striped blue. part a: Describe the relationship between egg size and clutch size shown in Figure 1. (This is not asking about host plants, just about the butterfly eggs.) part b: Describe one possible reason for the relationship between egg size and clutch size observed. (This is not asking about the host plants, just about the butterfly eggs.)  part c:Describe one realistic difference between host plants that might be affecting the numbers and sizes of eggs that a female lays on these plants.

In Figure 2a and 2d, what can you determine aboutthe ability of the parasite to infect its host?

The bacteria that cause plague, Yersinia pestis, maintain their existence in a cycle involving rodents and their fleas. In urban areas or places with dense rat infestations, the plague bacteria can cycle between rats and their fleas. The last urban outbreak of rat-associated plague in the United States occurred in Los Angeles in 1924-­1925. Plague bacteria are most often transmitted by the bite of an infected flea. Plague-infected fleas usually bite rates or mice, but dogs and cats may also bring infected fleas into the home. Question: who is the host and who is the agent?

Discuss how changes in organisms within an environment affect their survival. Specifically discuss the effects of a gene mutation for color in beetles. << Read Less

What is the Red Queen Dynamic?  Using the snail example, explain why different parasite and host genotypes are expected to oscillate in frequency?  Why would this favor sexual reproduction or outcrossing?

Looking at Figure 1 above, do locations that have a history of Paralytic Shellfish Poisoning typically have a population with a higher frequency of sensitive or resistant clams? Speculate as to why.

1) Many organisms have the ability to reproduce asexually as well as perform sexual reproduction. A Scientist, John Smith, was conducting research on aphids that can undergo both methods of reproduction. He determined the males in his population had fertilization rate of 1.8 and a relative fitness of outcrossed offspring was 1.1. a) What is the equilibrium frequency of males in this population? b) Is this population stable equilibrium and why?

The current pandemic COVID-19 (coronavirus disease 2019) is caused by 2019-nCoV (2019 novel coronavirus). You just learned about the transmission rate hypothesis for the evolution of pathogen virulence and the power of natural selection. Which of the following statements may go through your mind?   - For individuals infected with a more virulent viral strain, each cough is likely to contain more virus particles when compared to individuals who are infected with a less virulent strain. Therefore, uninfected individuals will have a higher chance of being infected when encountering the droplets from individuals infected with a more virulent strain.   - However, individuals infected with a more virulent viral strain is likely to get sick sooner and show severer symptoms, thus will have less time being out and about when compared to individuals infected with a less virulent viral strain.   - If there is no public health measures on social distancing to prevent congregation,…