Fundamentals And Evidence Of Evolutionary Biology Practice Tests

Question 1

In a population of $N$ individuals, if a specific allele frequency $p$ changes to $p'$ over one generation due to microevolutionary forces, determine the change in allele frequency $\Delta p = p' - p$. If $p = 0.4$ and $p' = 0.42$, what is the magnitude of the change?

Accepted Answer

0.02

Answer

0.01

Answer

0.04

Answer

0.82

Question 2

If a population of 1,000 organisms produces 5,000 offspring, but only 10% survive to reproductive age due to limited resources, calculate the total number of survivors $S$ using the formula $S = N_{offspring} 	imes R$, where $R$ is the survival rate.

Accepted Answer

500

Question 3

Consider a model of natural selection where the fitness of genotype $AA$ is $w_{AA} = 1.0$, $Aa$ is $w_{Aa} = 0.9$, and $aa$ is $w_{aa} = 0.8$. If the current frequency of $A$ is $p=0.5$ and $a$ is $q=0.5$, calculate the mean fitness of the population $\bar{w} = p^2w_{AA} + 2pqw_{Aa} + q^2w_{aa}$.

Accepted Answer

0.9

Answer

0.85

Answer

0.95

Answer

1.0

Question 4

If microevolution is defined as the change in allele frequencies within a population, then the observation of a shift in the mean beak depth of a finch population from $10.0	ext{ mm}$ to $10.5	ext{ mm}$ over one generation constitutes evidence of microevolution.

Accepted Answer

True

Answer

False

Question 5

Which of the following scenarios represent the application of empirical thought as opposed to non-physical explanations in evolutionary biology?

Answer

Measuring the correlation between beak depth and seed hardness in Galápagos finches

Answer

Quantifying the survival rate of offspring in relation to resource availability

Answer

Attributing species variation to mystical or non-physical forces

Answer

Assuming species traits are immutable and fixed by design

Question 6

Lamarck proposed that if an organism changes during its life to adapt to its environment, those changes are passed to its offspring. If a giraffe stretches its neck by $L = 0.5	ext{ meters}$ and this trait were perfectly inherited, calculate the total neck length of the offspring if the parent's base length was $2.0	ext{ meters}$.

Accepted Answer

2.5 meters

Question 7

In a study of natural selection, if the probability of survival for individuals with trait $x$ is given by $P(x) = \frac{1}{1 + e^{-(x-5)}}$, determine the survival probability for an individual with trait value $x = 5$.

Accepted Answer

0.5

Answer

0.25

Answer

0.75

Answer

1.0

Question 8

A paleontologist discovers a fossil sequence where the average limb length $L$ of a species changes over time $t$ (in millions of years) according to the function $L(t) = 0.5t^2 + 2t + 10$. Calculate the rate of change of limb length at $t = 3$ million years.

Accepted Answer

5 units per million years

Answer

3 units per million years

Answer

10 units per million years

Answer

16 units per million years

Question 9

Two isolated island populations of a bird species have diverged. Population A has a mean beak depth of $12$ mm with a variance of $\sigma^2 = 4$, and Population B has a mean of $16$ mm with a variance of $\sigma^2 = 4$. If the selection differential $S$ is $2$ mm and the narrow-sense heritability $h^2$ is $0.5$, calculate the predicted response to selection $R$ using the breeder's equation $R = h^2 S$.

Accepted Answer

1 mm

Question 10

In a study of convergent evolution, two unrelated species in similar environments show a protein sequence similarity of $S = 40\%$. If the expected similarity due to random chance is $E = 5\%$, and the total number of amino acid sites is $N = 200$, how many sites are identical due to factors other than random chance?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 11

If the probability of a specific vestigial structure appearing in a population is $P(V) = 0.02$, and the probability of a related developmental homology appearing is $P(H) = 0.05$, assuming these traits are independent, the probability of both appearing in a single individual is $P(V \cap H) = 0.001$.

Accepted Answer

True

Answer

False

Question 12

Which of the following scenarios represent evidence of convergent evolution rather than common ancestry? Select all that apply.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 13

A breeder is selecting for larger corn kernels. The current mean kernel mass is $M_0 = 300$ mg. After one generation of selective breeding, the mean mass of the offspring is $M_1 = 330$ mg. If the selection differential $S$ was $100$ mg, calculate the narrow-sense heritability $h^2$.

Accepted Answer

0.3

Question 14

Consider the fossil record of horses. If the height of a horse ancestor $H$ at time $t$ (in millions of years ago) is modeled by $H(t) = H_0 e^{kt}$, where $H_0 = 0.5$ meters and $k = 0.1$, determine the height of the horse after $t = 10$ million years.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 15

Two homologous protein sequences have a length of $L = 400$ amino acids. If the observed number of amino acid differences is $d = 80$, calculate the proportion of sites that differ, $p$.

Accepted Answer

0.20

Answer

0.05

Answer

0.10

Answer

0.80

Question 16

A gene family has expanded through duplication. If the original gene had a mutation rate of $\mu = 10^{-9}$ mutations per site per year, and the two paralogs have diverged for $T = 50$ million years, calculate the expected number of substitutions per site ($K$) assuming $K = 2\mu T$.

Accepted Answer

0.1

Question 17

In a population, a new gene variant created by exon shuffling provides a fitness advantage. If the initial frequency of the variant is $q_0 = 0.01$ and the selection coefficient is $s = 0.05$, determine the frequency $q_1$ after one generation using the model $q_1 = \frac{q_0(1+s)}{1 + s q_0}$.

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 18

If two species share a chromosomal inversion, it is mathematically impossible for this to have occurred via independent mutation events if the probability of such an inversion is $P < 10^{-12}$ per generation.

Accepted Answer

True

Answer

False

Question 19

Which of the following mechanisms contribute to genomic evolution and structural changes?

Answer

Horizontal gene transfer

Answer

Chromosomal inversion

Answer

Gene duplication

Answer

Mitotic cell division

Question 20

A bacterial population undergoes horizontal gene transfer. If the rate of acquisition of a new gene is $\lambda = 0.02$ genes per generation, calculate the expected number of acquired genes after $n = 10$ generations, assuming the process follows a linear accumulation model $E[X] = \lambda n$.

Accepted Answer

0.2

Fundamentals And Evidence Of Evolutionary Biology Practice Tests

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Fundamentals and Evidence of Evolutionary Biology

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