Question 1

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

Accepted Answer

The two alleles for a heritable character separate during gamete formation, and end up in different gametes, so each gamete only gets one allele, not both.

Question 2

A true-breeding plant with purple flowers (PP) is crossed with a true-breeding plant with white flowers (pp). What is the expected genotype and phenotype ratio in the F1 generation?

Accepted Answer

Genotype: 1 Pp; Phenotype: 1 purple

Question 3

In snapdragons, red flowers (RR) and white flowers (rr) show incomplete dominance, producing pink flowers (Rr) in the heterozygote. If two pink-flowered plants are crossed, what is the expected phenotypic ratio in the offspring?

Accepted Answer

1 red : 2 pink : 1 white

Question 4

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

Accepted Answer

Alleles for different genes assort independently of one another during gamete formation if they are located on different homologous chromosome pairs.

Question 5

A cross is made between two horses, both heterozygous for black color ($$Bb) $$and trotting gait ($$Tt). $$What is the probability of getting a black trotting horse in the offspring?

Accepted Answer

$$\frac{9}{16}$$

Question 6

In a dihybrid cross between $$RrTt$$ and $$RrTt$$ snapdragons, what is the probability of producing an offspring with genotype $$rrtt$$?

Accepted Answer

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

Question 7

Which of the following is an example of a gene with multiple alleles in humans?

Accepted Answer

ABO blood group

Question 8

A man with genotype $$I^A I^B$$ marries a woman with genotype $$ii. $$What are the possible blood types of their children?

Accepted Answer

Type A and type B only

Question 9

If you cross $$AABbcc$$ with $$AabbCc$$, what is the probability of producing the genotype $$AABbCc in $$the offspring?

Accepted Answer

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

Question 10

Which statement best describes a true-breeding individual?

Accepted Answer

An individual that produces offspring with only one phenotype when self-pollinated.

Question 11

In a population of flowering plants, the smooth seed trait ($$S) is $$dominant to wrinkled seed ($$s). If $$two heterozygous plants ($$Ss) $$are crossed, what is the expected phenotypic ratio among their offspring?

Accepted Answer

3 smooth : 1 wrinkled

Question 12

Which of the following best describes incomplete dominance?

Accepted Answer

The heterozygote has a phenotype intermediate between the two homozygotes.

Question 13

A pedigree shows a trait that skips generations and appears only when both parents are carriers. What type of inheritance does this suggest?

Accepted Answer

Autosomal recessive

Question 14

How many unique gametes can be produced by an individual with genotype $$AaBbCc$$?

Accepted Answer

8

Question 15

In a cross between $$BbTt$$ and $$BbTt$$ horses, what is the probability of getting a chestnut pacing horse ($$bbtt$$)?

Accepted Answer

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

Question 16

Which of the following best defines a genotype?

Accepted Answer

The genetic makeup of an organism, such as PP or Pp.

Question 17

If a plant with genotype $$RrSs is $$crossed with another $$RrSs$$ plant, what is the probability of producing an offspring with genotype $$rrss$$?

Accepted Answer

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

Question 18

Which of the following is NOT a correct definition?

Accepted Answer

Homozygous: an organism with two different alleles for a gene

Question 19

A cross between two heterozygous pea plants ($$Yy) $$for seed color produces what expected ratio of yellow to green seeds?

Accepted Answer

3 yellow : 1 green

Question 20

Which of the following best describes a monohybrid cross?

Accepted Answer

A genetic cross between two organisms that are heterozygous for one trait.

Mendelian Genetics and Patterns of Inheritance: Study Guide (Ch. 11-12)

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