Question 1

Which of the following best explains why offspring produced by sexual reproduction are genetically different from their parents?

Accepted Answer

Because meiosis and fertilization shuffle alleles, resulting in unique combinations of genes.

Question 2

A human somatic cell contains 46 chromosomes. How many chromosomes are present in a human gamete?

Accepted Answer

$$23$$

Question 3

Which process is responsible for reducing the chromosome number from diploid to haploid in sexually reproducing organisms?

Accepted Answer

Meiosis

Question 4

During which phase of meiosis do homologous chromosomes separate and move toward opposite poles?

Accepted Answer

Anaphase I

Question 5

In plants, the alternation of generations includes both a multicellular diploid stage and a multicellular haploid stage. What are these stages called?

Accepted Answer

Sporophyte (diploid) and gametophyte (haploid)

Question 6

If an organism has a haploid number $$n = 4$$, how many possible combinations of chromosomes can result from independent assortment during meiosis?

Accepted Answer

$$2^4 = 16$

Question 7

Which of the following events occurs only during meiosis and not mitosis?

Accepted Answer

Synapsis and crossing over between homologous chromosomes

Question 8

A geneticist is studying a mutation that affects the synaptonemal complex. Which process would most likely be disrupted in the mutant organism?

Accepted Answer

Crossing over during prophase I

Question 9

Which of the following best describes the difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring, while sexual reproduction produces genetically diverse offspring.

Question 10

Which mechanism contributes most directly to the genetic uniqueness of siblings (except identical twins)?

Accepted Answer

All of the above

Question 11

A diploid cell with $$2n = 8$$ undergoes meiosis. How many chromosomes will each daughter cell have at the end of meiosis II?

Accepted Answer

$$4$$

Question 12

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry genes controlling the same inherited characters.

Question 13

In humans, what is the probability that a child will inherit a particular combination of chromosomes from both parents, considering only independent assortment (not crossing over)?

Accepted Answer

$$1 in$$ $$2^{23}$

Question 14

Which of the following is a direct result of crossing over during meiosis?

Accepted Answer

Formation of recombinant chromosomes

Question 15

A certain plant species has a sporophyte with 40 chromosomes. How many chromosomes will be found in each gamete produced by this species?

Accepted Answer

$$20$$

Question 16

Which of the following best explains why the Cavendish banana is highly susceptible to disease outbreaks?

Accepted Answer

It is a clone population with little genetic variation.

Question 17

Which of the following statements about meiosis is FALSE?

Accepted Answer

Meiosis conserves the chromosome number of the parent cell.

Question 18

A mutation occurs in a gene located at a specific locus on a chromosome. Which of the following is TRUE regarding this gene?

Accepted Answer

It will be found at the same locus on the homologous chromosome.

Question 19

Which of the following is NOT a mechanism that contributes to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during S phase

Question 20

In a medical case, a patient is found to have an abnormal number of chromosomes in their somatic cells. Which process most likely failed during gamete formation?

Accepted Answer

Proper segregation of chromosomes during meiosis

Meiosis and Sexual Life Cycles: Study Guide for General Biology

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