Question 1

Which of the following best describes the outcome of meiosis in terms of chromosome number and genetic variation?

Accepted Answer

Four haploid cells with unique genetic combinations

Question 2

During which phase of meiosis do homologous chromosomes separate, and what is the significance of this event?

Accepted Answer

Anaphase I; it ensures each gamete receives only one chromosome from each homologous pair

Question 3

If a human cell with 46 chromosomes undergoes meiosis, how many chromosomes will each resulting gamete contain?

Accepted Answer

$$23$$

Question 4

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

Accepted Answer

Crossing over

Question 5

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

Accepted Answer

$$0.25$$

Question 6

Which of the following best explains Mendel’s Law of Independent Assortment?

Accepted Answer

Alleles of different genes assort independently of one another during gamete formation

Question 7

In a dihybrid cross between two heterozygous pea plants ($$RrYy 	imes RrYy$$), what is the expected phenotypic ratio among the offspring?

Accepted Answer

$$9:3:3:1$$

Question 8

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 9

If two parents are both heterozygous for sickle cell anemia ($$Ss$$), what is the probability that their child will be homozygous normal?

Accepted Answer

$$0.25$$

Question 10

Which of the following events does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during interphase

Question 11

A karyotype shows 47 chromosomes, including three copies of chromosome 21. What condition does this represent?

Accepted Answer

Down syndrome

Question 12

Which of the following best describes the purpose of meiosis?

Accepted Answer

To reduce the chromosome number by half and increase genetic diversity

Question 13

If a gene is located on the X chromosome, which of the following statements is true?

Accepted Answer

Males are more likely to express recessive X-linked traits

Question 14

In a test cross between a plant with genotype $$Tt ($$tall) and $$tt ($$short), what is the expected ratio of tall to short offspring?

Accepted Answer

$$1:1$$

Question 15

Which of the following is an example of codominance?

Accepted Answer

A person with AB blood type expressing both A and B antigens

Question 16

If a woman with blood type A (genotype $$I^A I^O) $$has a child with a man with blood type B (genotype $$I^B I^O$$), which blood type is NOT possible for their child?

Accepted Answer

None of the above

Question 17

Which of the following best describes a genetic linkage map?

Accepted Answer

A diagram showing the relative positions of genes based on recombination frequencies

Question 18

A man with normal vision (X$$^NY) $$and a woman who is a carrier for colorblindness (X$$^NX$^n) $$have a daughter. What is the probability that the daughter will be colorblind?

Accepted Answer

$$0$$

Question 19

Which of the following scenarios best illustrates Mendel’s Law of Segregation?

Accepted Answer

A plant with genotype $$Aa$$ produces gametes with either $$A or$$ $$a$$

Question 20

If two genes are located close together on the same chromosome, which of the following is most likely?

Accepted Answer

They will be inherited together more often than not

Genetics, Meiosis, and Inheritance: Study Guide and Practice

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