Question 1

Which of the following best describes the main genetic difference between asexual and sexual reproduction?

Accepted Answer

Asexual reproduction produces offspring that are genetically identical to the parent, while sexual reproduction produces genetically diverse offspring.

Question 2

In which of the following organisms does binary fission serve as the primary mode of reproduction?

Accepted Answer

Prokaryotes

Question 3

During the human ovarian cycle, which hormone surge directly triggers ovulation?

Accepted Answer

Luteinizing hormone (LH)

Question 4

Which of the following best explains the effect of administering high doses of exogenous progesterone on the female reproductive endocrine axis?

Accepted Answer

It inhibits the release of LH and FSH from the pituitary via negative feedback, reducing ovarian steroid synthesis.

Question 5

Which of the following events occurs during Prophase I of meiosis and contributes to genetic diversity?

Accepted Answer

Crossing over between homologous chromosomes

Question 6

A diploid organism has a genotype AaBb. According to Mendel’s Law of Independent Assortment, what is the expected ratio of gamete genotypes produced by this organism?

Accepted Answer

$$1:1:1:1$$ for AB, Ab, aB, ab

Question 7

Which of the following best defines a gene?

Accepted Answer

A segment of DNA that encodes a functional product, usually a protein.

Question 8

In a human cell at the end of meiosis I, what is the ploidy and chromosome composition?

Accepted Answer

Haploid, with chromosomes still consisting of two sister chromatids.

Question 9

A woman who is a carrier for an X-linked recessive trait (X[33mb[0mX) has a child with a man who does not have the trait (XY). What is the probability that their son will express the trait?

Accepted Answer

$$0.5$$

Question 10

Which of the following best describes the physical basis of Mendel’s Law of Segregation?

Accepted Answer

Separation of homologous chromosomes during Anaphase I of meiosis

Question 11

Which of the following is a correct statement about the alternation of generations in plants?

Accepted Answer

It involves alternating multicellular haploid (gametophyte) and multicellular diploid (sporophyte) stages.

Question 12

Which of the following scenarios best illustrates parthenogenesis?

Accepted Answer

A female lizard produces offspring from unfertilized eggs.

Question 13

Which of the following best describes the role of the corpus luteum during the luteal phase of the ovarian cycle?

Accepted Answer

It secretes progesterone to maintain the endometrium.

Question 14

A researcher observes a cell with chromosomes aligned at the metaphase plate, each chromosome consisting of two sister chromatids, and the cell is haploid. Which stage of meiosis is this?

Accepted Answer

Metaphase II

Question 15

Which of the following is a real-world example of a sex-linked recessive trait in humans?

Accepted Answer

Hemophilia

Question 16

If a cell with $$2n = 4$$ undergoes meiosis, how many genetically unique gametes can be produced, assuming independent assortment and no crossing over?

Accepted Answer

$$2^2 = 4$

Question 17

Which of the following best describes the function of the hypothalamus in the reproductive endocrine axis?

Accepted Answer

It secretes GnRH, which stimulates the pituitary to release FSH and LH.

Question 18

A pedigree shows that a trait appears in every generation and affected individuals have at least one affected parent. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 19

Which of the following statements about mitosis and meiosis is correct?

Accepted Answer

Mitosis produces two genetically identical diploid cells, while meiosis produces four genetically unique haploid cells.

Comprehensive Study Guidance for College Biology Exam: Reproduction, Meiosis, and Heredity

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