Question 1

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

Accepted Answer

Each individual has two alleles for a trait, and these alleles separate during gamete formation so that each gamete receives only one allele.

Question 2

In a monohybrid cross between two heterozygous pea plants (Aa x Aa), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$

Question 3

Which of the following statements about the Law of Independent Assortment is correct?

Accepted Answer

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

Question 4

A dihybrid cross between two individuals heterozygous for both traits (RrYy x RrYy) produces which classic Mendelian phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 5

If a plant with genotype Aa is crossed with a plant with genotype aa, what is the probability that an offspring will be homozygous recessive?

Accepted Answer

$$0.5$$

Question 6

Which of the following best defines a genotype?

Accepted Answer

The alleles an individual carries for a gene.

Question 7

In a family with three children, what is the probability that exactly two will be boys and one will be a girl (order not specified)?

Accepted Answer

$$\frac{3}{8}$$

Question 8

Which formula is used to calculate the chi-square statistic in genetics?

Accepted Answer

$$\$$chi^2$$ = \sum \frac{(O - E)^2$}{E}$$

Question 9

A geneticist observes a 3:1 phenotypic ratio in the F2 generation of a cross. What does this suggest about the parents?

Accepted Answer

Both parents are heterozygous for the trait.

Question 10

Which of the following is an example of empirical probability in genetics?

Accepted Answer

Counting the number of times a phenotype appears in a real-life cross and dividing by the total number of offspring.

Question 11

In a pedigree analysis, which of the following is a characteristic of autosomal dominant inheritance?

Accepted Answer

Each affected individual has at least one affected parent.

Question 12

If the observed and expected results in a genetic cross are not significantly different (P \u003e 0.05), what is the correct interpretation?

Accepted Answer

Fail to reject the null hypothesis; the results are consistent with Mendelian inheritance.

Question 13

Which of the following best describes the product rule in genetics?

Accepted Answer

The probability of two independent events both occurring is the product of their individual probabilities.

Question 14

A couple has four children. What is the probability that exactly three of them are girls (order not specified)?

Accepted Answer

$$\frac{1}{4}$$

Question 15

Which of the following is NOT a feature of autosomal recessive inheritance?

Accepted Answer

Each affected individual must have at least one affected parent.

Question 16

In a dihybrid cross, how many different allele combinations are possible in the gametes produced by an individual with genotype RrYy?

Accepted Answer

4

Question 17

Which of the following best explains why the Law of Independent Assortment occurs during meiosis?

Accepted Answer

Homologous chromosome pairs align independently at metaphase I.

Question 18

A genetic cross yields the following observed F2 phenotypes: 162 round yellow, 54 round green, 54 wrinkled yellow, and 18 wrinkled green. What is the expected ratio for these phenotypes according to Mendelian genetics?

Accepted Answer

$$9:3:3:1$$

Question 19

Which of the following is the correct formula for calculating the probability of a specific outcome in a genetic cross using the binomial expansion?

Accepted Answer

$$P = \frac{n!}{k!(n-k)!} p^k q$$^{n-k}$$

Mendelian Genetics: Transmission and Classical Genetics (Chapter 2, Module 3, Part 2)

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