Question 1

Which of the following best describes the mechanism of evolution proposed by Charles Darwin?

Accepted Answer

Natural selection acting on heritable variation

Question 2

Darwin’s theory of natural selection requires three conditions to be met. Which of the following is NOT one of those conditions?

Accepted Answer

All individuals must have identical fitness

Question 3

Gregor Mendel’s Law of Segregation states that:

Accepted Answer

The two alleles for a heritable character separate during gamete formation

Question 4

In Mendel’s pea plant experiments, crossing two heterozygous plants for seed color ($$Yy 	imes Yy) $$results in what expected phenotypic ratio in the offspring?

Accepted Answer

$$3:1$$ yellow to green

Question 5

Which real-world example best illustrates artificial selection as described by Darwin?

Accepted Answer

The breeding of wild mustard into cabbage, broccoli, and Brussels sprouts

Question 6

According to Mendel’s Law of Independent Assortment, which of the following is true?

Accepted Answer

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

Question 7

A pea plant with genotype $$Yy ($$yellow seeds) is crossed with a plant with genotype $$yy ($$green seeds). What is the expected genotypic ratio of the offspring?

Accepted Answer

$$1:1 Yy to yy$$

Question 8

Which process during meiosis is most directly responsible for the Law of Segregation?

Accepted Answer

Separation of homologous chromosomes during meiosis I

Question 9

Why did Darwin’s focus on populations rather than individuals represent a revolutionary shift in evolutionary biology?

Accepted Answer

It recognized that evolution acts on groups with heritable variation, not just on individuals

Question 10

Which of the following best explains why the recessive trait reappeared in Mendel’s F2 generation?

Accepted Answer

Recessive alleles were masked by dominant alleles in the F1 generation

Question 11

Which scenario demonstrates the Law of Independent Assortment in a dihybrid cross ($$YyRr 	imes YyRr$$)?

Accepted Answer

Traits for seed color and seed shape are inherited independently, resulting in a $$9:3:3:1$$ phenotypic ratio

Question 12

Which of the following is an example of a phenotype?

Accepted Answer

Purple flowers in a pea plant

Question 13

If a diploid organism has a genotype $$Pp$$, what gametes can it produce according to Mendel’s Law of Segregation?

Accepted Answer

Both P and p

Question 14

Which event during sexual reproduction increases genetic variation in offspring?

Accepted Answer

Crossing over during meiosis

Question 15

A population of beetles shows variation in shell color. If birds preferentially eat beetles with lighter shells, what evolutionary process is most likely occurring?

Accepted Answer

Natural selection

Question 16

Which of the following best describes a homozygous genotype?

Accepted Answer

An organism with two identical alleles for a gene

Question 17

In a concept map of meiosis, sexual life cycles, and variation, which process directly produces haploid ($$n) $$gametes from a diploid ($$2n) $$adult?

Accepted Answer

Meiosis

Question 18

Which of the following statements about Mendel’s experiments is correct?

Accepted Answer

Mendel’s plants showed discrete, intact traits in each generation

Question 19

Which of the following is a direct consequence of the Law of Segregation during meiosis?

Accepted Answer

Each gamete receives only one allele for each gene

Question 20

Which of the following best explains why genes located close together on the same chromosome tend to be inherited together?

Accepted Answer

They are less likely to be separated by crossing over

Darwin, Mendel, and the Foundations of Evolution and Heredity

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