Question 1

Which of the following best describes the relationship between a gene, its locus, and a trait as illustrated in the first image?

Accepted Answer

A gene is a segment of DNA located at a specific locus on a chromosome, and it codes for a trait.

Question 2

Based on the second image, which statement correctly distinguishes asexual reproduction from sexual reproduction?

Accepted Answer

Asexual reproduction produces genetically identical offspring from a single parent, while sexual reproduction produces genetically diverse offspring from two parents.

Question 3

A human somatic cell contains 46 chromosomes. How many pairs of chromosomes does it have?

Accepted Answer

23 pairs

Question 4

If a cell has a diploid number of $$2n = 6$$, how many possible combinations of chromosomes can result from independent assortment during meiosis?

Accepted Answer

$$2^3 = 8$

Question 5

Which event occurs during prophase I of meiosis that does NOT occur during mitosis?

Accepted Answer

Homologous chromosomes pair up and crossing over occurs

Question 6

What is the main outcome of meiosis II, as shown in the images?

Accepted Answer

Sister chromatids are separated into four haploid cells

Question 7

Which mechanism contributes most directly to genetic variation among offspring in sexually reproducing organisms?

Accepted Answer

Crossing over during prophase I of meiosis

Question 8

In humans, how many chromosomes are present in a gamete, and what is this number called?

Accepted Answer

23 chromosomes, haploid

Question 9

Which of the following is a major difference between mitosis and meiosis?

Accepted Answer

Meiosis produces four genetically unique haploid cells, while mitosis produces two genetically identical diploid cells.

Question 10

During which phase of meiosis do homologous chromosomes separate, and what is the result?

Accepted Answer

Anaphase I; homologous chromosomes are separated

Question 11

A plant exhibits alternation of generations. Which stage is diploid and produces haploid spores by meiosis?

Accepted Answer

Sporophyte

Question 12

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

Accepted Answer

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

Question 13

If a sperm cell containing an X chromosome fertilizes an egg, what will be the sex chromosome composition of the resulting zygote?

Accepted Answer

XX

Question 14

Which process is responsible for the formation of recombinant chromosomes, as shown in the synaptonemal complex image?

Accepted Answer

Crossing over

Question 15

A karyotype is used to examine chromosomes. What information can be obtained from a karyotype?

Accepted Answer

The number, size, and shape of chromosomes in a cell

Question 16

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 17

During meiosis, what is the significance of the chiasmata observed in prophase I?

Accepted Answer

They are sites where homologous chromosomes exchange genetic material

Question 18

Which of the following is true regarding the chromosome number in the cells produced by meiosis compared to the original cell?

Accepted Answer

Each daughter cell has half the chromosome number of the original cell

Question 19

Which step in meiosis is responsible for the reduction in chromosome number from diploid to haploid?

Accepted Answer

Separation of homologous chromosomes in anaphase I

Question 20

Why does random fertilization further increase genetic variation in sexually reproducing organisms?

Accepted Answer

Because any sperm can fuse with any ovum, combining two sets of independently assorted chromosomes

Meiosis, Chromosome Behavior, and Genetic Variation: Study Notes for General Biology

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