Question 1

Which of the following best explains why asexual reproduction is advantageous for bacteria in a stable environment?

Accepted Answer

It produces genetically identical offspring quickly, ensuring successful traits are maintained.

Question 2

A plant species reproduces using runners (stolons). Which statement about the offspring is correct?

Accepted Answer

They are genetically identical to the parent plant.

Question 3

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

Accepted Answer

Anaphase I; haploid

Question 4

Which process increases genetic variation during meiosis and occurs specifically during Prophase I?

Accepted Answer

Crossing over

Question 5

A diploid organism has a gene with three possible alleles in the population. How many different alleles for this gene can a single individual possess?

Accepted Answer

Two

Question 6

A pedigree shows a trait that appears in every generation and is present in both males and females. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 7

Given the DNA sequence 5’–ATGCCGTA–3’, what is the complementary DNA strand?

Accepted Answer

3’–TACGGCAT–5’

Question 8

Which enzyme is responsible for joining Okazaki fragments during DNA replication?

Accepted Answer

DNA ligase

Question 9

In eukaryotic cells, where does transcription occur and what is the main enzyme involved?

Accepted Answer

Nucleus; RNA polymerase

Question 10

A mutation causes a stop codon to appear early in an mRNA sequence. What is the likely result during translation?

Accepted Answer

A truncated (shortened) protein is produced.

Question 11

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

Accepted Answer

They regulate the binding of RNA polymerase to the promoter.

Question 12

Which equation describes exponential population growth, and what does each variable represent?

Accepted Answer

$$\Delta N / \Delta T = rN$$, where $$N is $$population size and $$r is $$per capita growth rate.

Question 13

A population of birds is reduced from 1000 to 50 individuals by a wildfire. Which evolutionary process is most likely to affect allele frequencies in the survivors?

Accepted Answer

Bottleneck effect

Question 14

Which type of natural selection favors individuals with intermediate phenotypes and selects against both extremes?

Accepted Answer

Stabilizing selection

Question 15

In a food web, only about 10% of energy is transferred from one trophic level to the next. What happens to the remaining energy?

Accepted Answer

It is lost as heat or used for metabolic processes.

Question 16

Which pattern of dispersion is most likely for plants that secrete chemicals into the soil to inhibit the growth of nearby individuals?

Accepted Answer

Uniform

Question 17

A population of beetles has the following genotype frequencies: 0.4 AA, 0.4 Aa, 0.2 aa. What is the allele frequency of 'A'?

Accepted Answer

0.6

Question 18

Which of the following is a shared derived character (synapomorphy) for land plants?

Accepted Answer

Cuticle

Question 19

Which of the following best describes the difference between genetic drift and natural selection?

Accepted Answer

Genetic drift changes allele frequencies by chance, while natural selection changes them based on fitness.

Question 20

Which of the following is the correct formula for the Shannon diversity index, and what does a higher value indicate?

Accepted Answer

$$H = -\sum (p_i \ln p_i)$$; higher value means greater diversity

Comprehensive Study Guide: Genetics, Evolution, and Ecology (BIOL 1307)

Study Guide - Practice Questions

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