Question 1

Which process is responsible for reducing the chromosome number by half in gametes, ensuring genetic diversity in sexually reproducing organisms?

Accepted Answer

Meiosis

Question 2

In humans, what is the diploid number of chromosomes found in somatic cells?

Accepted Answer

$$2n = 46$$

Question 3

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

Accepted Answer

Synapsis and crossing over between homologous chromosomes

Question 4

If a human gamete contains $$n = 23$$ chromosomes, how many possible combinations of chromosomes can result from independent assortment alone?

Accepted Answer

$$2^{23} = 8$$,388,608$$

Question 5

Which statement best describes the difference between asexual and sexual reproduction?

Accepted Answer

Sexual reproduction involves the fusion of gametes from two parents, resulting in genetic variation.

Question 6

During which phase of meiosis do homologous chromosomes separate?

Accepted Answer

Anaphase I

Question 7

What is the primary source of genetic variation in sexually reproducing populations?

Accepted Answer

Crossing over, independent assortment, and random fertilization

Question 8

A zygote is formed by the fusion of two gametes. If each gamete can produce $$2^{23}$$ possible chromosome combinations, how many possible diploid combinations can result from fertilization (not accounting for crossing over)?

Accepted Answer

$$2^{46}$$

Question 9

Which term refers to the transmission of traits from one generation to the next?

Accepted Answer

Heredity

Question 10

What is the scientific study of heredity and variation called?

Accepted Answer

Genetics

Question 11

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.

Question 12

Which process restores the diploid number of chromosomes in sexually reproducing organisms?

Accepted Answer

Fertilization

Question 13

During meiosis, what is the result after two consecutive cell divisions?

Accepted Answer

Four haploid daughter cells genetically distinct from each other and the parent cell

Question 14

Which event during meiosis increases genetic variation by exchanging genetic material between homologous chromosomes?

Accepted Answer

Crossing over

Question 15

A cell with $$2n = 6$$ undergoes meiosis. How many chromosomes will each gamete contain?

Accepted Answer

$$3$$

Question 16

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

Accepted Answer

Replication of DNA during mitosis

Question 17

What is the term for a group of genetically identical individuals produced from a single parent?

Accepted Answer

Clone

Question 18

Which phase of meiosis II is most similar to mitosis?

Accepted Answer

Meiosis II as a whole

Question 19

If a mutation occurs in a gene, what is the result?

Accepted Answer

A new version of the gene called an allele may be created

Question 20

Which of the following best describes the role of meiosis in evolution?

Accepted Answer

Meiosis produces genetic variation, which contributes to evolution

Meiosis and Sexual Life Cycles: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard