Question 1

Which of the following best explains why offspring produced by sexual reproduction are genetically different from their parents and from each other?

Accepted Answer

Because sexual reproduction involves crossing over and independent assortment during meiosis.

Question 2

Which mechanism of asexual reproduction is most commonly observed in prokaryotes?

Accepted Answer

Binary fission

Question 3

During which phase of meiosis do homologous chromosomes separate, and what is the ploidy of the resulting cells?

Accepted Answer

Anaphase I; haploid

Question 4

A diploid organism has a gene with two alleles, A and a. How many alleles for this gene can a single individual possess, and how does this compare to the number of alleles in the population?

Accepted Answer

An individual can have two alleles; the population can have more than two alleles.

Question 5

Given the DNA sequence $$5'	ext{-}ATGCGTACG-3'$$, what is the complementary DNA strand?

Accepted Answer

$$3'	ext{-}TACGCATGC-5'$$

Question 6

Which of the following best describes the role of transcription factors in eukaryotic gene expression?

Accepted Answer

They bind to specific DNA sequences to regulate the transcription of genes.

Question 7

A woman who is a carrier for an X-linked recessive trait (X	extsuperscript{B}X	extsuperscript{b}) and a man who does not have the trait (X	extsuperscript{B}Y) have a son. What is the probability that their son will inherit the trait?

Accepted Answer

$$0.25$$

Question 8

Which of the following equations represents exponential population growth, and what does each variable represent?

Accepted Answer

$$\frac{\Delta N}{\Delta T} = rN$$, where $$N is $$population size, $$r is $$per capita growth rate, and $$T is $$time.

Question 9

Which of the following is an example of genetic drift?

Accepted Answer

A population of beetles is reduced to a few individuals after a flood, and the survivors have different allele frequencies than the original population.

Question 10

Which of the following best describes the difference between stabilizing selection and disruptive selection?

Accepted Answer

Stabilizing selection favors intermediate phenotypes, while disruptive selection favors extreme phenotypes.

Question 11

Which process occurs in the cytoplasm of eukaryotic cells and involves the decoding of mRNA into a polypeptide chain?

Accepted Answer

Translation

Question 12

If a population of 100 rabbits has a per capita growth rate ($$r) of$$ $$0.1$$ per month, what is the expected change in population size ($$\Delta N) $$after one month under exponential growth?

Accepted Answer

$$\Delta N = 10$$

Question 13

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA polymerase synthesizes new DNA strands in the 5' to 3' direction.

Question 14

Which of the following best describes the difference between random evolution and adaptive evolution?

Accepted Answer

Adaptive evolution increases fitness due to selection pressure, while random evolution changes allele frequencies by chance.

Question 15

Which of the following is a correct statement about the Shannon index in ecology?

Accepted Answer

The Shannon index incorporates both species richness and evenness.

Question 16

Which of the following best describes the energy transfer between trophic levels in an ecosystem?

Accepted Answer

About 10% of the energy at one trophic level is transferred to the next level.

Question 17

Which of the following is true about the anti-parallel arrangement of DNA?

Accepted Answer

One strand runs 5' to 3' and the other runs 3' to 5'.

Question 18

Which of the following is a density-dependent factor regulating population size?

Accepted Answer

A contagious disease spreading more rapidly as population density increases.

Question 19

Which of the following best describes the difference between meiosis I and meiosis II?

Accepted Answer

Meiosis I reduces chromosome number by half, while meiosis II separates sister chromatids.

Question 20

Which of the following is true about the start of translation in eukaryotes?

Accepted Answer

Translation begins at the 5' end of the mRNA.

Comprehensive Study Notes: Reproduction, Heredity, DNA, Evolution, and Ecology

Study Guide - Practice Questions

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