Question 1

Which of the following best describes the difference between diploid and haploid cells?

Accepted Answer

Diploid cells contain two sets of chromosomes, while haploid cells contain one set.

Question 2

If a human somatic cell contains 46 chromosomes, how many chromosomes are found in a human gamete?

Accepted Answer

$$n = 23$$

Question 3

Which process is responsible for producing genetically unique gametes during sexual reproduction?

Accepted Answer

Meiosis

Question 4

What is the main significance of crossing over during meiosis?

Accepted Answer

It increases genetic variation among offspring.

Question 5

Which formula can be used to calculate the number of possible combinations of chromosomes due to independent assortment in a species with $$n$$ pairs of chromosomes?

Accepted Answer

$$2^n$$

Question 6

A karyotype is useful for determining which of the following?

Accepted Answer

The number and structure of chromosomes in an individual

Question 7

During fertilization, what is restored when two gametes fuse?

Accepted Answer

The diploid chromosome number

Question 8

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

Accepted Answer

Genetic variation among offspring

Question 9

If an onion cell has 16 chromosomes, how many chromosomes are present in an onion gamete?

Accepted Answer

$$n = 8$$

Question 10

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

Accepted Answer

Genetic variation from independent assortment, crossing over, and random fertilization

Question 11

What is the correct sequence of events during meiosis I?

Accepted Answer

Homologous chromosomes pair, crossing over occurs, homologous pairs separate

Question 12

Which of the following is true about mutations that occur during meiosis?

Accepted Answer

They can be passed on to offspring if they occur in gametes.

Question 13

Which of the following best describes a homologous pair of chromosomes?

Accepted Answer

Two chromosomes with the same genes but possibly different alleles

Question 14

What is the result of meiosis in terms of chromosome number and genetic diversity?

Accepted Answer

Four haploid cells, each genetically different from the parent cell

Question 15

Which of the following is a key advantage of internal fertilization compared to external fertilization?

Accepted Answer

Greater protection of gametes and developing embryos

Question 16

If a species has 5 pairs of chromosomes, how many genetically different gametes can it produce due to independent assortment alone?

Accepted Answer

$$2^5 = 32$

Question 17

Which of the following structures is only visible during cell division and not in interphase?

Accepted Answer

Replicated chromosomes

Question 18

What is the term for the fusion of egg and sperm to form a single cell with a unique genetic constitution?

Accepted Answer

Fertilization

Question 19

Which of the following best explains why the chance of two siblings being genetically identical (except for identical twins) is extremely low?

Accepted Answer

The combination of independent assortment, crossing over, and random fertilization creates immense genetic diversity.

Meiosis, Chromosomes, and Genetic Variation: Laboratory Supplement Study Notes

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