Question 1

Which of the following best describes the main difference between asexual and sexual reproduction, as illustrated by the hydra and redwoods in the first image?

Accepted Answer

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

Question 2

A karyotype, as shown in the second image, is most useful for which of the following purposes?

Accepted Answer

Identifying the number and structure of chromosomes in a cell.

Question 3

In the third image, which structure represents a pair of homologous chromosomes?

Accepted Answer

One red and one blue chromosome of the same length and centromere position.

Question 4

Referencing the fourth image, what is the ploidy of the zygote immediately after fertilization in humans?

Accepted Answer

$$2n$$

Question 5

Based on the fifth image, which process restores the diploid number of chromosomes in the animal life cycle?

Accepted Answer

Fertilization

Question 6

According to the sixth image, what is the result of meiosis II?

Accepted Answer

Four haploid cells with unduplicated chromosomes

Question 7

During which stage of meiosis I, as shown in the seventh image, do homologous chromosomes separate?

Accepted Answer

Anaphase I

Question 8

The eighth image illustrates crossing over. What is the genetic significance of this process?

Accepted Answer

It increases genetic variation by exchanging DNA between homologous chromosomes.

Question 9

Based on the ninth image, which of the following statements correctly compares mitosis and meiosis?

Accepted Answer

Mitosis conserves chromosome number, while meiosis reduces it by half.

Question 10

The tenth image demonstrates independent assortment. If an organism has $$n$$ pairs of chromosomes, how many possible combinations of chromosomes can be produced by independent assortment alone?

Accepted Answer

$$2^n$$

Question 11

Which of the following events is unique to meiosis I and does NOT occur in mitosis, as shown in the images?

Accepted Answer

Synapsis and crossing over between homologous chromosomes

Question 12

A mutation occurs in a gene during DNA replication. According to the study materials, what is the evolutionary significance of this mutation?

Accepted Answer

It creates a new allele, contributing to genetic variation in the population.

Question 13

If a human cell at metaphase I of meiosis contains 46 chromosomes, how many chromosomes will each daughter cell have at the end of meiosis II?

Accepted Answer

23

Question 14

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

Accepted Answer

Independent assortment, crossing over, and random fertilization create unique combinations of alleles.

Question 15

During which phase of meiosis does the synaptonemal complex form, as shown in the eighth image?

Accepted Answer

Prophase I

Question 16

A plant cell with a diploid number of 8 ($$2n = 8) $$undergoes meiosis. How many chromosomes will each gamete contain?

Accepted Answer

4

Question 17

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

Accepted Answer

Formation of recombinant chromosomes

Question 18

If a mutation prevents the formation of chiasmata during meiosis, what would be the most likely consequence?

Accepted Answer

Reduced genetic variation due to lack of crossing over

Question 19

Which of the following statements about homologous chromosomes is correct?

Accepted Answer

They carry genes controlling the same inherited characters, but may have different alleles.

Question 20

A scientist observes a cell with chromosomes aligned in pairs at the metaphase plate. Which stage of cell division is this cell most likely in?

Accepted Answer

Metaphase I of meiosis

Cell Division, Meiosis, and Genetic Variation: Study Notes for General Biology

Guida di studio - Domande di pratica

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