Which of the following observations about populations shaped Darwin’s principles of natural selection? Select all that apply.     As a population expands, resources that are used by its individuals eventually become limited.   Individuals within a population naturally vary in the details of shared traits.   Individuals of a population that are better able to survive tend to leave more offspring.   Natural populations have an inherent capacity to increase in size over time.   When resources are limited, the individuals of a population compete for those resources.

Suppose scientists studied a species of plant that grows in shady environments. They measured the size of leaves in two plant populations and found that the size distribution was similar. In addition, they found that plants with larger leaves tended to produce more seeds and that their offspring tended to have large leaves. The scientists also measured the selection differential, S, of leaf size in each population. In population A, S equalled 1 cm². In population B, S equalled 2 cm?. Assume that the heritability of leaf size in the two populations is the same. Predict how the difference in S between the populations will affect the evolution of leaf size in these populations. O After a given number of generations, the leaves in population B will be larger than those in A. Because S indicates variance in leaf size, leaf size will evolve more rapidly in population B than in A. Environment plays a larger role in determining leaf size in population B than in population A. Because S…

Thinking about Natural Selection and Adaption, what if instead the predators were 4 different spoons: ¼ teaspoon, 1 teaspoon, 1 tablespoon, and 1 large serving spoon? Then what if each time beans (the prey) were captured, they had to be immediately emptied into a narrow-necked jar (with an opening about the size of 1 teaspoon)? What do you think the outcome of the experiment might be in this new situation? (Which “predator” will be the most successful, which the next most, etc. down to the least successful, and why?) Be sure to explain your reasoning

Suppose there is a deleterious mutation in some human gene that causes loss of function very late in life. Which of the following statements is LEAST supported? Selection against this mutation is weak The equilibrium frequency of this mutation will depend on its mutation rate The mutation affects fitness but not senescence Selection against this allele depends on extrinsic mortality.

Which part of these statements isn't right ?       A species is a group of organisms that can potentially interbreed with one another to produce viable, fertile offspring. Speciation is when two new species form from one original one. Sympatric speciation occurs when there is a geographic separation of a population. Allopatric speciation occurs while the population remains in the same area. Adaptive radiation occurs when one species evolves into many to fill several different niches. Natural selection requires traits to be passed from parent to offspring, more offspring are produced than can survive creating competition, and inherited traits vary among offspring. Fossils, Anatomy and embryology, biogeography, and molecular biology all provide support for the theory of evolution. Evolution can be driven by many different things. Mutations are changes in DNA that create new alleles in a population. Gene flow is the flow of alleles in and out of a population resulting from the migration…

The following table provides phenotypic data for a population of mammoths living in cold environments based on fossil and DNA evidence. Based on this data and your knowledge of natural selection, which explanation best explains the trends seen in the data? Individuals with thicker fur had a survival advantage in the cold environment, allowing these individuals to reproduce more often and create more offspring.   Individuals within this population of mammoths tend to only mate with individuals that have thick fur.   This population of mammoths appear to be in Hardy-Weinberg equilibrium since no allele frequencies are changing over time.   Individuals with thick fur migrated into the population of mammoths, increasing the proportion of these individuals.

The main idea behind Darwin’s theory of natural selection was Group of answer choices a. Competition for space between the individuals will limit a population b. Individuals pass on acquired characteristics to their offspring c. Individuals with advantageous adaptations are more likely to out-produce those lacking that adaptation d. Populations adapt over time

Gene flow often increases genetic diversity of populations that come together. Which of these is an example of when gene flow could reduce genetic diversity if two populations (Population A and Population B) come together? O The offspring with parents from population A and B have low survival because they are not adapted to the environment. O Individuals from population A have an allele that is not found in population B. O Individuals from population B have an allele that is not found in population B O Population A only has homozygous recessive alleles and population B only has homozygous dominant alleles.

You have sequenced the Rag1 gene in two populations of snails that vary in the amount of parasites. The Rag1 gene codes for proteins that affect the immune system. The results were analyzed looking for synonymous and nonsynonymous substitutions and are in the table below. Determine if the populations are under selection and comment on which population has the higher infection of parasites.     Population 1 Population 2 Synonymous 5 6 Nonsynonymous 4 13

Natural selection operates on populations over many generations. Which of the following allows natural selection to occur?    A.  the desire and the advantage of a population to remain constant  B.  the old age of the individuals which causes them to die  C.  the abilty for populations to change quickly from one trait to the next  D.  the unequal ability of individuals to survive and reproduce