Question 1

Which of the following best explains how meiosis contributes to genetic variation in sexually reproducing organisms?

Accepted Answer

Meiosis allows for independent assortment and crossing over, resulting in new combinations of alleles.

Question 2

According to Mendel's Law of Independent Assortment, which of the following is true during gamete formation?

Accepted Answer

Each pair of alleles segregates independently of other pairs during gamete formation.

Question 3

A human genetic disorder is found to be more common in males than females. Which inheritance pattern is most likely responsible?

Accepted Answer

X-linked recessive

Question 4

Which of the following diagrams correctly represents the process of meiosis I?

Accepted Answer

Homologous chromosomes separate, reducing the chromosome number by half.

Question 5

In a cross between two heterozygous individuals for a single gene ($$Aa 	imes Aa$$), what is the expected genotypic ratio among the offspring?

Accepted Answer

$$1:2:1 (AA$$:Aa:aa)

Question 6

Which scenario best illustrates polygenic inheritance?

Accepted Answer

Multiple genes contribute to the continuous variation in human skin color.

Question 7

Which of the following is a consequence of nondisjunction during meiosis?

Accepted Answer

Formation of gametes with abnormal chromosome numbers, such as trisomy 21.

Question 8

Which of the following best describes the role of natural selection in evolution?

Accepted Answer

Natural selection acts on heritable variation, favoring traits that increase reproductive success.

Question 9

Which of the following is NOT a requirement for natural selection to occur?

Accepted Answer

Unlimited resources for all individuals

Question 10

A population of beetles shows variation in shell color. Birds preferentially eat beetles with lighter shells. Over time, the frequency of dark-shelled beetles increases. This is an example of:

Accepted Answer

Directional selection

Question 11

Which equation is used to calculate allele frequencies in a population under Hardy-Weinberg equilibrium?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 12

Which of the following best explains why recessive genetic disorders can persist in a population?

Accepted Answer

Heterozygous individuals can carry the allele without expressing the disorder.

Question 13

Which process increases genetic diversity in a population by exchanging genetic material between homologous chromosomes?

Accepted Answer

Crossing over during meiosis

Question 14

Which of the following is an example of a multifactorial disorder?

Accepted Answer

Type 2 diabetes influenced by multiple genes and environmental factors

Question 15

Which statement best describes the difference between genotype and phenotype?

Accepted Answer

Genotype refers to the genetic makeup, while phenotype refers to the observable traits.

Question 16

Which of the following would most likely result in the formation of a new species?

Accepted Answer

A population is split by a geographic barrier, leading to reproductive isolation and genetic divergence.

Question 17

Which of the following best explains why some genetic disorders are more frequent in certain populations?

Accepted Answer

Founder effect and genetic drift can increase the frequency of specific alleles in isolated populations.

Question 18

Which of the following is a direct result of Mendel's Law of Segregation?

Accepted Answer

Each gamete receives only one allele of each gene.

Question 19

Which evolutionary mechanism is most likely responsible for a sudden change in allele frequencies due to a random event, such as a natural disaster?

Accepted Answer

Genetic drift

Question 20

Which of the following best describes disruptive selection?

Accepted Answer

Selection favors individuals at both extremes of a trait distribution.

Genetics and Evolution: Study Notes for Biology 114 Exam Review

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