Question 1

Which process during sexual reproduction is primarily responsible for increasing genetic variation among offspring?

Accepted Answer

Crossing over during meiosis

Question 2

Gregor Mendel’s Law of Independent Assortment states that:

Accepted Answer

Alleles for different traits assort independently of each other during meiosis

Question 3

A population of rabbits has two alleles for fur color: $$A ($$dominant) and $$a ($$recessive). If the frequency of $$A is$$ $$0.7$$, what is the frequency of $$a$$?

Accepted Answer

$$0.3$$

Question 4

Which of the following is an example of codominance?

Accepted Answer

ABO blood group where both A and B alleles are expressed

Question 5

In Hardy-Weinberg equilibrium, if $$p = 0.85$$, what is $$q$$?

Accepted Answer

$$0.15$$

Question 6

A child is born with Down syndrome due to nondisjunction. Which chromosomal abnormality is most likely present?

Accepted Answer

Trisomy 21

Question 7

Which of the following is NOT an assumption of Hardy-Weinberg equilibrium?

Accepted Answer

Small population size

Question 8

A heterozygous pea plant ($$Rr) is $$crossed with a homozygous recessive ($$rr). $$What is the expected phenotypic ratio in the offspring?

Accepted Answer

1:1

Question 9

Which evolutionary mechanism is most likely to cause allele frequencies to change due to random chance in a small population?

Accepted Answer

Genetic drift

Question 10

If a population is in Hardy-Weinberg equilibrium and the frequency of the dominant allele ($$p) is$$ $$0.6$$, what is the expected frequency of heterozygotes ($$2pq$$)?

Accepted Answer

$$0.48$$

Question 11

Which of the following best describes incomplete dominance?

Accepted Answer

The phenotype is intermediate between the two homozygotes

Question 12

Which process is responsible for the separation of homologous chromosomes during meiosis?

Accepted Answer

Meiosis I

Question 13

Which of the following is a real-world example of parthenogenesis?

Accepted Answer

Aphids reproducing asexually

Question 14

What is the main consequence of nondisjunction during meiosis?

Accepted Answer

Abnormal number of chromosomes in gametes

Question 15

Which of the following is a key difference between microevolution and macroevolution?

Accepted Answer

Microevolution involves changes in allele frequencies within a population; macroevolution involves changes that lead to new species or groups of species

Question 16

Which of the following is NOT a type of selection described in population genetics?

Accepted Answer

Random selection

Question 17

Which statement best describes the concept of genetic drift?

Accepted Answer

It is the change in allele frequencies due to random sampling in small populations

Question 18

Which of the following is a correct application of the Hardy-Weinberg equation for a population with two alleles, $$A$$ and $$a$$?

Accepted Answer

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

Question 19

Which of the following is a real-world consequence of the anthropocene epoch?

Accepted Answer

Increased rates of habitat modification and species extinction

Question 20

Which of the following is an example of a dihybrid cross?

Accepted Answer

Crossing RRyy x rryy

Comprehensive Study Notes: Genetics – Mendelian Principles, Chromosome Behavior, and Population Genetics

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