Q: Which formula would you use to calculate the probability of two independent genetic events occurring simultaneously?

$$P(A \text{ and } B) = P(A) \times P(B)$$

Question 1

Which of the following best describes Mendel's Law of Segregation?

Accepted Answer

Alleles for a trait separate during gamete formation, so each gamete receives only one allele.

Question 2

A heterozygous pea plant (Yy) is crossed with a homozygous recessive plant (yy) for seed color. What is the expected phenotypic ratio in the offspring?

Accepted Answer

$$1:1$$

Question 3

Which statement correctly explains the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes are pairs of chromosomes with the same genes but possibly different alleles, while sister chromatids are identical copies of a single chromosome.

Question 4

In a dihybrid cross between two heterozygous individuals ($$RrYy 	imes RrYy$$), what is the expected phenotypic ratio according to Mendel's Law of Independent Assortment?

Accepted Answer

$$9:3:3:1$$

Question 5

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

Accepted Answer

Color blindness

Question 6

A male with genotype $$X^A Y$$ and a female with genotype $$X^A X^a$$ for an X-linked trait have children. What is the probability that a son will express the recessive trait?

Accepted Answer

$$0.5$$

Question 7

Which process is responsible for the separation of homologous chromosomes during meiosis?

Accepted Answer

Anaphase I

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

Which formula would you use to calculate the probability of two independent genetic events occurring simultaneously?

Accepted Answer

$$P(A 	ext{ and } B) = P(A) 	imes P(B)$$

Question 10

Which of the following best describes the difference between haplosufficient and haploinsufficient alleles?

Accepted Answer

Haplosufficient alleles produce a normal phenotype with only one copy present, while haploinsufficient alleles require two copies for normal function.

Question 11

During which phase of mitosis do sister chromatids separate and move toward opposite poles?

Accepted Answer

Anaphase

Question 12

A couple, both carriers for cystic fibrosis ($$Ff$$), want to know the probability that their child will have cystic fibrosis. What is the probability?

Accepted Answer

$$0.25$$

Question 13

Which of the following is NOT a function of meiosis?

Accepted Answer

Replication of somatic cells for growth and repair

Question 14

In a test cross, a plant with an unknown genotype for a dominant trait is crossed with a homozygous recessive plant. If all offspring show the dominant phenotype, what is the genotype of the unknown parent?

Accepted Answer

Homozygous dominant

Question 15

Which of the following best explains why X-linked recessive disorders are more common in males than females?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will result in the disorder.

Question 16

Which diagram would you use to predict the outcome of a genetic cross between two individuals for a single gene?

Accepted Answer

Punnett square

Question 17

A woman who is heterozygous for an X-linked trait ($$X^A X^a) $$and a man who is hemizygous ($$X^a Y) $$have a daughter. What is the probability that the daughter will be a carrier?

Accepted Answer

$$0.5$$

Question 18

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

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

Question 19

Which term describes the observable physical characteristics of an organism resulting from its genotype?

Accepted Answer

Phenotype

Question 20

A pedigree shows a trait that skips generations and is more common in males. What is the most likely mode of inheritance?

Accepted Answer

X-linked recessive

Genetics Study Guide: Single Gene Inheritance, Mitosis & Meiosis, Sex Linkage, and Gene Interactions UNIT 1 STUDY GUIDE

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