Question 1

Which statement best describes the cell theory as presented in the study materials?

Accepted Answer

Cells are the basic unit of life, and all cells arise from preexisting cells.

Question 2

During which phase of the cell cycle does a cell spend most of its lifetime performing normal functions and preparing for division?

Accepted Answer

Interphase

Question 3

What is the primary difference between mitosis and meiosis in terms of chromosome number in the resulting cells?

Accepted Answer

Mitosis produces diploid cells, while meiosis produces haploid cells.

Question 4

A human cell contains 46 chromosomes. After meiosis, how many chromosomes will each gamete contain?

Accepted Answer

$$23$$

Question 5

Which process during meiosis increases genetic variation by exchanging genetic material between homologous chromosomes?

Accepted Answer

Crossing over

Question 6

If a child is born with Down syndrome, which chromosomal abnormality is most likely present?

Accepted Answer

Three copies of chromosome 21

Question 7

Which of the following best explains why siblings from the same parents can have different genetic traits?

Accepted Answer

Independent assortment and random fertilization during sexual reproduction.

Question 8

A heterozygous individual for a gene with alleles $$A ($$dominant) and $$a ($$recessive) will have which genotype and phenotype?

Accepted Answer

Genotype: $$Aa$$, Phenotype: dominant

Question 9

In a dihybrid cross between two individuals with genotype $$BbDd$$, what is the probability that an offspring will be homozygous recessive for both traits ($$bbdd$$)?

Accepted Answer

$$\frac{1}{16}$$

Question 10

Which blood type is considered the universal donor, and why?

Accepted Answer

Type O-, because it lacks A, B, and Rh antigens.

Question 11

A genetic disorder is caused by a recessive allele on the X chromosome. Which group is most likely to express the disorder?

Accepted Answer

Males with one copy of the recessive allele

Question 12

Which term describes a situation where one gene influences multiple, seemingly unrelated phenotypic traits?

Accepted Answer

Pleiotropy

Question 13

In snapdragons, flower color shows incomplete dominance. If two pink-flowered plants ($$Rr) $$are crossed, what is the expected ratio of red:pink:white offspring?

Accepted Answer

$$1:2:1$$

Question 14

Which of the following is an example of polygenic inheritance?

Accepted Answer

Height in humans

Question 15

What is the result of nondisjunction during meiosis?

Accepted Answer

Gametes with too few or too many chromosomes

Question 16

Which process is used in therapeutic cloning to produce stem cells for medical research?

Accepted Answer

Removal of cells from a cloned embryo

Question 17

If a black Labrador (genotype $$Bb) is $$crossed with a chocolate Labrador ($$bb$$), what percentage of the offspring will be chocolate?

Accepted Answer

$$50\%$$

Question 18

Which of the following best describes codominance?

Accepted Answer

Both alleles are expressed equally in the phenotype.

Question 19

Linked genes are most likely to be inherited together because:

Accepted Answer

They are located close together on the same chromosome.

Question 20

Which of the following is NOT a source of genetic variation in sexually reproducing organisms?

Accepted Answer

Mitosis

Chromosomes, Cell Division, and Inheritance: Study Notes for General Biology

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