Chromosomes and Haploid & Diploid Cells Quizs

How many sex chromosomes are shown in this karyotype of human chromosomes:

• 2

• 3

• 23

• 45

• 46

Answer explanation

In a human karyotype, there are 23 pairs of chromosomes, including 1 pair of sex chromosomes (XX or XY). Therefore, the total number of sex chromosomes is 2, making the correct answer 2.

Sea turtles have 28 pairs of chromosomes. How many autosomes do sea turtles have?

• 28

• 56

• 54

• 26

Answer explanation

Sea turtles have 28 pairs of chromosomes, totaling 56 chromosomes. Since 2 of these are sex chromosomes, the remaining 54 are autosomes. Therefore, sea turtles have 54 autosomes.

In humans, haploid (n) cells have ____ chromosomes and diploid cells (2n) have ____ chromosomes.

• 92, 46

• 13, 23

• 46, 23

• 23, 46

• 46, 92

Answer explanation

In humans, haploid cells (n) have 23 chromosomes, while diploid cells (2n) have 46 chromosomes. Therefore, the correct answer is 23 for haploid and 46 for diploid.

Each body cell in an earthworm contains 36 chromosomes.  How many chromosomes are in each of its gametes?

• 54

• 36

• 72

• 18

Answer explanation

Each body cell of the earthworm has 36 chromosomes, which is diploid (2n). Gametes are haploid (n), so they contain half the number of chromosomes. Therefore, each gamete has 18 chromosomes.

What is the correct definition of a haploid cell?

• A cell with only a single set of chromosomes. (Humans: 23 = n)

• A cell with two sets of chromosomes (Humans: 46 = 2n)

• A cell with three copies of one chromosome

• A cell with four copies of one chromosome

Answer explanation

A haploid cell contains only one set of chromosomes, which in humans is 23 (n). This distinguishes it from diploid cells, which have two sets (46 = 2n). The other options describe different chromosome configurations.

In humans, how many chromosomes do haploid daughter cells have after completing Meiosis?

• 13

• 23

• 46

• 92

Answer explanation

In humans, haploid daughter cells produced by meiosis contain half the number of chromosomes found in diploid cells. Since humans have 46 chromosomes (23 pairs), haploid cells have 23 chromosomes.

How are your chromosomes inherited?

• most of your chromosomes from your mother

• most of your chromosomes from your father

• a random number of chromosomes from each parent

• half your chromosomes from your mother and half from your father.

Answer explanation

You inherit half of your chromosomes from your mother and half from your father, resulting in a complete set of 46 chromosomes. This ensures genetic diversity and the combination of traits from both parents.

Human brain cells have ____ chromosomes; humans gametes have ____ chromosomes.

• 13, 23

• 23, 46

• 46, 23

• 46, 92

• 23, 13

Answer explanation

Human brain cells contain 46 chromosomes, which are diploid, while human gametes (sperm and egg) have 23 chromosomes, being haploid. Therefore, the correct answer is 46 for brain cells and 23 for gametes.

Identify if this person is a biological female or male. Support your answer.

• Male, as chromosome 23 has an X and a Y chromosome.

• Male, as chromosome 23 has two Y chromosomes.

• Female, as chromosome 23 has an X and a Y chromosome.

• Female, as chromosome 23 has two X chromosomes.

• It is not possible to tell the biological sex.

Answer explanation

The correct answer is 'Female, as chromosome 23 has two X chromosomes.' This indicates a biological female, as females typically have two X chromosomes (XX) in their 23rd pair, while males have one X and one Y (XY).

A human zygote should have _____ chromosomes inside the nucleus.

• 46

• 23

• 92

• 64

Answer explanation

A human zygote has 46 chromosomes, which consist of 23 pairs. Each parent contributes 23 chromosomes, resulting in the total of 46. Therefore, the correct answer is 46.