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

Question 1

Which of Mendel's postulates explains why offspring inherit one allele from each parent for a given trait?

Accepted Answer

Unit factors exist in pairs

Question 2

In Mendel's monohybrid cross between true-breeding purple and white flowered pea plants, what was the phenotypic ratio observed in the F2 generation?

Accepted Answer

3:1

Question 3

If a pea plant has the genotype Ww for flower color, what is the probability that a gamete produced by this plant will carry the 'w' allele?

Accepted Answer

$$\frac{1}{2}$$

Question 4

A dihybrid cross between two heterozygous pea plants (YyRr x YyRr) produces what phenotypic ratio in the F2 generation?

Accepted Answer

9:3:3:1

Question 5

Which equation is used to calculate the probability of two independent genetic events occurring simultaneously?

Accepted Answer

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

Question 6

In a testcross, an individual with a dominant phenotype is crossed with a homozygous recessive individual. What is the purpose of this cross?

Accepted Answer

To determine if the dominant phenotype is homozygous or heterozygous

Question 7

If two heterozygous parents (Dd x Dd) have two children, what is the probability that both children will be homozygous recessive?

Accepted Answer

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

Question 8

Which of the following best describes the chromosomal theory of inheritance?

Accepted Answer

Genes are located on chromosomes, and their behavior during meiosis explains Mendelian principles

Question 9

What is the formula for calculating the number of possible gamete combinations in an organism with a haploid number $$n$$?

Accepted Answer

$$2^n$$

Question 10

In a cross between a tall heterozygous plant (Dd) and a dwarf plant (dd), what is the expected genotypic ratio among the offspring?

Accepted Answer

1 Dd : 1 dd

Question 11

Which law explains why the outcome of tossing a penny is independent of the outcome of tossing a nickel?

Accepted Answer

Law of independent events

Question 12

What is the formula for the chi-square ($$\$$chi^2$$) test used to evaluate genetic data?

Accepted Answer

$$\$$chi^2$$ = \sum \frac{(o-e)^2$}{e}$$

Question 13

If the null hypothesis is rejected in a chi-square analysis, what does this indicate about the observed genetic data?

Accepted Answer

The observed deviation is not due to chance alone

Question 14

Which of the following traits is an example of a recessive human genetic disorder?

Accepted Answer

Cystic fibrosis

Question 15

In a trihybrid cross (AaBbCc x AaBbCc), what is the expected proportion of offspring with the genotype aabbcc?

Accepted Answer

$$\frac{1}{64}$$

Question 16

Which of the following best describes a phenotype?

Accepted Answer

The physical expression of the genetic makeup

Question 17

What is the probability that in the F2 generation of a monohybrid cross, a tall plant is heterozygous?

Accepted Answer

$$\frac{2}{3}$$

Question 18

Which of the following statements about Mendel's work is true?

Accepted Answer

Mendel's work proposed discontinuous variation, where phenotypes fall into distinct classes

Question 19

If a pea plant with genotype GgWw produces gametes, what is the probability of producing a gamete with genotype gw?

Accepted Answer

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

Question 20

Which method is easier to use than a Punnett square for analyzing inheritance of a large number of traits?

Accepted Answer

Forked-line (branched diagram) method

Mendelian Genetics: Principles, Experiments, and Applications

Study Guide - Practice Questions