Question 1

Which of the following best describes the difference between asexual and sexual reproduction in terms of genetic variation?

Accepted Answer

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

Question 2

In humans, how many chromosomes are found in a somatic cell and what is the term used to describe this chromosome number?

Accepted Answer

46 chromosomes; diploid

Question 3

During meiosis, what is the significance of crossing over in prophase I?

Accepted Answer

It produces recombinant chromosomes, increasing genetic variation.

Question 4

Which equation represents the number of possible chromosome combinations due to independent assortment in gametes, where $$n is $$the haploid number?

Accepted Answer

$$2^n$$

Question 5

A cell with a diploid number of 6 ($$2n=6) $$undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

3 chromosomes

Question 6

Which stage of meiosis is characterized by the separation of homologous chromosomes?

Accepted Answer

Anaphase I

Question 7

In the alternation of generations life cycle seen in plants, what is the function of the sporophyte?

Accepted Answer

It produces haploid spores by meiosis.

Question 8

Which of the following events is unique to meiosis and does NOT occur in mitosis?

Accepted Answer

Synapsis and crossing over between homologous chromosomes

Question 9

If a mutation occurs in a gene, what is the immediate result in terms of genetic diversity?

Accepted Answer

The mutation creates a new allele, increasing genetic diversity.

Question 10

Which process restores the diploid chromosome number after it has been halved during meiosis?

Accepted Answer

Fertilization

Question 11

In most fungi and some protists, which stage is the only diploid stage in their life cycle?

Accepted Answer

Zygote

Question 12

Which of the following best explains why siblings from the same parents are genetically different?

Accepted Answer

Independent assortment, crossing over, and random fertilization create genetic variation.

Question 13

During which phase of meiosis do sister chromatids finally separate?

Accepted Answer

Anaphase II

Question 14

Which term describes the specific location of a gene on a chromosome?

Accepted Answer

Locus

Question 15

A human sperm cell contains 22 autosomes and which type of sex chromosome?

Accepted Answer

Either X or Y chromosome

Question 16

Which mechanism contributes most directly to the genetic variation observed in a population?

Accepted Answer

Crossing over during meiosis

Question 17

If a diploid cell with $$2n=8$$ undergoes meiosis, how many genetically distinct gametes can be produced by independent assortment alone?

Accepted Answer

$$2^4 = 16$

Question 18

Which of the following statements about gametes is correct?

Accepted Answer

Gametes are haploid cells produced by meiosis.

Question 19

What is the evolutionary significance of genetic variation produced by sexual reproduction?

Accepted Answer

It allows natural selection to favor traits best suited to the environment.

Question 20

Which of the following best describes the outcome of meiosis in terms of chromosome number and genetic identity?

Accepted Answer

Four haploid cells, each genetically distinct

Meiosis and Sexual Life Cycles: Structured Study Notes

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