Question 1

Which statement best describes the difference between a character and a trait in genetics?

Accepted Answer

A character is a heritable feature that varies among individuals, while a trait is a variant of that character.

Question 2

In Mendel’s experiments, what is the expected phenotypic ratio in the F2 generation when crossing two heterozygous pea plants for flower color (Pp x Pp)?

Accepted Answer

3:1 (Purple:White)

Question 3

Which of the following best explains Mendel’s law of segregation?

Accepted Answer

Alleles for each character separate during gamete formation, so each gamete carries only one allele for each character.

Question 4

A testcross is performed between a black dog of unknown genotype and a chocolate dog (bb). If all offspring are black, what is the genotype of the black dog?

Accepted Answer

BB

Question 5

Which equation represents the probability of obtaining a homozygous recessive offspring from two heterozygous parents (Aa x Aa)?

Accepted Answer

$$P = \frac{1}{4}$$

Question 6

Which of the following is an example of incomplete dominance in humans?

Accepted Answer

Hypercholesterolemia, where heterozygotes have intermediate cholesterol levels

Question 7

If a person with genotype IAIB has blood type AB, which inheritance pattern does this demonstrate?

Accepted Answer

Codominance

Question 8

Which of the following best describes pleiotropy?

Accepted Answer

One gene influences several characters.

Question 9

A couple, both carriers for cystic fibrosis (a recessive disorder), have a child. What is the probability that their child will be a carrier?

Accepted Answer

$$P = \frac{1}{2}$$

Question 10

Which statement is true regarding Mendel’s law of independent assortment?

Accepted Answer

Alleles of different genes assort independently during gamete formation.

Question 11

Which of the following is an example of polygenic inheritance?

Accepted Answer

Height in humans

Question 12

Which genotype would result in a person with type O blood?

Accepted Answer

ii

Question 13

Which of the following best describes a carrier for a recessive genetic disorder?

Accepted Answer

An individual with one dominant and one recessive allele who does not show symptoms.

Question 14

Which of the following is NOT a possible genotype for a pea plant with purple flowers, assuming purple is dominant (P) and white is recessive (p)?

Accepted Answer

pp

Question 15

Which equation represents the expected genotypic ratio for a monohybrid cross (Aa x Aa)?

Accepted Answer

$$1:2:1 (AA$$:Aa:aa)

Question 16

Which of the following is a real-world example of a dominant genetic disorder?

Accepted Answer

Achondroplasia

Question 17

Which of the following best describes epigenetic inheritance?

Accepted Answer

Transmission of traits by mechanisms not directly involving DNA sequence.

Question 18

A plant with genotype TtYy (T=tall, t=dwarf, Y=yellow, y=green) is crossed with another plant of the same genotype. According to Mendel’s law of independent assortment, what is the probability of obtaining a tall plant with green seeds?

Accepted Answer

$$P = \frac{3}{16}$$

Question 19

Which of the following is true about homozygous and heterozygous genotypes?

Accepted Answer

Homozygous means two identical alleles; heterozygous means two different alleles.

Question 20

Which of the following best explains why most genetic disorders are caused by recessive alleles?

Accepted Answer

Recessive alleles can be carried without affecting the phenotype, allowing them to persist in populations.

Patterns of Inheritance: Mendelian Genetics and Beyond

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