Question 1

Which of the following best explains why siblings from the same parents can look different from each other?

Accepted Answer

Independent assortment and crossing over during meiosis create unique combinations of alleles in each gamete.

Question 2

What is the primary difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring, while sexual reproduction increases genetic variation among offspring.

Question 3

If a human cell has 46 chromosomes, how many chromosomes will each gamete have after meiosis?

Accepted Answer

$$23$$

Question 4

Which event during meiosis is responsible for the exchange of genetic material between homologous chromosomes?

Accepted Answer

Crossing over during prophase I

Question 5

A diploid cell with $$2n = 8$$ undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$4$$

Question 6

Which of the following mechanisms does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during S phase

Question 7

What is the correct sequence of events in the human sexual life cycle?

Accepted Answer

Meiosis → Fertilization → Mitosis

Question 8

If the haploid number of a species is $$n = 10$$, how many possible chromosome combinations can be produced by independent assortment during gamete formation?

Accepted Answer

$$2^{10} = 1$$,024$$

Question 9

Which of the following statements about homologous chromosomes is TRUE?

Accepted Answer

They carry genes controlling the same inherited characters at the same loci.

Question 10

During which phase of meiosis do homologous chromosomes separate?

Accepted Answer

Anaphase I

Question 11

A mutation occurs in a gene that codes for eye color. What is the most immediate result of this mutation?

Accepted Answer

A new allele for eye color is created.

Question 12

Which of the following best describes the outcome of meiosis II?

Accepted Answer

Sister chromatids are separated into four genetically distinct haploid cells.

Question 13

Why does sexual reproduction contribute more to genetic variation than asexual reproduction?

Accepted Answer

Sexual reproduction allows for crossing over, independent assortment, and random fertilization.

Question 14

Which of the following is a direct result of fertilization in humans?

Accepted Answer

Formation of a diploid zygote

Question 15

A scientist observes a cell with two sets of chromosomes, each set from a different parent. What is the ploidy of this cell?

Accepted Answer

Diploid

Question 16

Which process is responsible for producing gametes in animals?

Accepted Answer

Meiosis

Question 17

If a mutation occurs during meiosis in a parent’s gamete, what is the potential consequence for the offspring?

Accepted Answer

The offspring may inherit a new allele not present in either parent.

Question 18

Which of the following best describes the relationship between genes, loci, and traits?

Accepted Answer

Genes are located at specific loci on chromosomes and code for traits.

Question 19

In a plant species with $$n = 12$$, how many different combinations of chromosomes can be produced in gametes due to independent assortment alone?

Accepted Answer

$$2^{12} = 4$$,096$$

Question 20

Which of the following is NOT a unique event to meiosis I?

Accepted Answer

Separation of sister chromatids

Meiosis and Sexual Life Cycles: Study Notes for Biology Students

Study Guide - Practice Questions

Study Guide - Flashcards