Question 1

Which of the following best describes the primary function of mitosis in multicellular organisms?

Accepted Answer

To generate genetically identical cells for growth and tissue repair

Question 2

During which phase of mitosis do chromosomes align along the center of the cell, and what is this region called?

Accepted Answer

Metaphase; metaphase plate

Question 3

Meiosis occurs in which type of cells and serves what main purpose?

Accepted Answer

Germ cells; to produce haploid gametes

Question 4

Which event is unique to prophase I of meiosis and does NOT occur in mitosis?

Accepted Answer

Homologous chromosomes pair and crossing over occurs

Question 5

A cell undergoes nondisjunction during meiosis II. What is the most likely result?

Accepted Answer

Some gametes will have an extra chromosome, and some will be missing one

Question 6

Which of the following correctly compares metaphase of mitosis, metaphase I, and metaphase II?

Accepted Answer

Only in metaphase I do homologous chromosomes line up as pairs; in mitosis and metaphase II, individual chromosomes align

Question 7

Gregor Mendel is known as the father of genetics. Which organism did he use for his foundational experiments?

Accepted Answer

Garden peas (Pisum sativum)

Question 8

In a dihybrid cross between two heterozygous individuals (AaBb x AaBb), what is the expected phenotypic ratio among the offspring?

Accepted Answer

$$9:3:3:1$$

Question 9

A woman with genotype $$X^N X^n ($$carrier for an X-linked recessive trait) and a man with genotype $$X^n Y$$ have a child. What is the probability that their son will express the recessive trait?

Accepted Answer

$$0.25$$

Question 10

Why are X-linked recessive traits more commonly expressed in men than in women?

Accepted Answer

Men have only one X chromosome, so a single recessive allele will be expressed

Question 11

Which enzyme is primarily responsible for adding new nucleotides during DNA replication?

Accepted Answer

DNA polymerase

Question 12

Given the DNA sequence $$5'	ext{-}CGGTAC	ext{-}3'$$, what is the complementary DNA strand?

Accepted Answer

$$3'	ext{-}GCCATG	ext{-}5'$$

Question 13

Transcribe the following DNA sequence into RNA: $$5'	ext{-}ATGCCG	ext{-}3'$$

Accepted Answer

Question 14

Given the DNA sequence $$3'	ext{-}TACGGA	ext{-}5'$$, what is the corresponding mRNA sequence produced during transcription?

Accepted Answer

$$5'	ext{-}AUGCCU	ext{-}3'$$

Question 15

If the mRNA sequence is $$5'	ext{-}AUGGCCUAA	ext{-}3'$$, what is the corresponding amino acid sequence? (Use a standard codon chart)

Accepted Answer

Methionine - Alanine - Stop

Question 16

A child is born with Down syndrome, which is caused by trisomy 21. This is most likely the result of which cellular event?

Accepted Answer

Nondisjunction during meiosis

Question 17

Which of the following best explains why genetic variation is increased during meiosis but not mitosis?

Accepted Answer

Crossing over and independent assortment occur during meiosis

Question 18

A man with genotype $$AaBb$$ and a woman with genotype $$aabb$$ have children. What is the probability that a child will have the genotype $$Aabb$$?

Accepted Answer

$$0.25$$

Question 19

Which of the following is true about the separation of chromosomes during anaphase of mitosis compared to anaphase I of meiosis?

Accepted Answer

Homologous chromosomes separate in meiosis I, sister chromatids in mitosis

Question 20

A scientist observes a cell with chromosomes lined up single file at the equator, each chromosome consisting of two sister chromatids. The cell then divides, producing two genetically identical cells. Which process is being observed?

Accepted Answer

Mitosis

Comprehensive Study Guide: Cell Division, Genetics, and Molecular Biology

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