Question 1

Which of the following best describes the concept of 'wild type' in genetics?

Accepted Answer

The trait that is most commonly observed in a population.

Question 2

Gregor Mendel's experimental approach included several innovations. Which of the following was NOT one of his critical innovations?

Accepted Answer

Traits with more than two physical forms.

Question 3

In a monohybrid cross between two pure-breeding pea plants (one with round seeds, one with wrinkled seeds), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$3:1$$

Question 4

Which law did Mendel derive from his monohybrid crosses?

Accepted Answer

Law of Segregation

Question 5

If a plant with genotype $$Rr ($$round seed) is crossed with a plant with genotype $$rr ($$wrinkled seed), what proportion of the offspring will have round seeds?

Accepted Answer

$$0.5$$

Question 6

Which statement best explains Mendel's Law of Independent Assortment?

Accepted Answer

Alleles of different genes assort independently during gamete formation if they are on different chromosomes.

Question 7

A dihybrid cross is performed between two heterozygous plants ($$RrGg 	imes RrGg). $$What is the expected phenotypic ratio in the F2 generation?

Accepted Answer

$$9:3:3:1$$

Question 8

Which of the following best describes an allele?

Accepted Answer

A variant form of a gene that arises by mutation.

Question 9

In Mendel's pea plant experiments, what was the genotype of the F1 generation when crossing two pure-breeding parents for a single trait?

Accepted Answer

All heterozygous ($$Rr)$$

Question 10

A test cross is performed between a plant with unknown genotype for seed shape and a homozygous recessive plant. If half the offspring are round and half are wrinkled, what is the genotype of the unknown parent?

Accepted Answer

Heterozygous ($$Rr)$$

Question 11

Which phase of meiosis is directly responsible for the segregation of alleles described in Mendel's Law #1?

Accepted Answer

Anaphase I

Question 12

If a parent has genotype $$Aa$$, what are the possible genotypes of its gametes?

Accepted Answer

$$A$$ and $$a$$

Question 13

In a dihybrid cross $$RrGg 	imes RrGg$$, what is the probability of obtaining an offspring with genotype $$rrgg$$?

Accepted Answer

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

Question 14

Which of the following is a correct application of a Punnett square for a monohybrid cross between $$Bb 	imes bb$$?

Accepted Answer

50% $$Bb$$, 50% $$bb$$

Question 15

A plant with genotype $$RrGg$$ can produce which of the following gametes?

Accepted Answer

$$RG$$, $$Rg$$, $$rG$$, $$rg$$

Question 16

Which of the following best explains why the phenotypes of offspring in Mendel's monohybrid crosses did NOT blend?

Accepted Answer

Alleles segregate independently and one is dominant over the other.

Question 17

In a dihybrid cross, what is the probability of obtaining an offspring that is heterozygous for both genes ($$RrGg) $$from $$RrGg 	imes RrGg$$?

Accepted Answer

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

Question 18

Which of the following is true regarding Mendel's Law of Independent Assortment?

Accepted Answer

It applies only to genes located on different chromosomes.

Question 19

A plant with genotype $$Aa is $$crossed with a plant with genotype $$aa. $$What is the expected genotypic ratio of the offspring?

Accepted Answer

$$1:1$$ ($$Aa:aa)$$

Transmission Genetics and Mendelian Inheritance: Study Notes Ch 2

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