Question 1

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

Accepted Answer

Alleles for a gene separate during gamete formation, so each gamete receives only one allele for each gene.

Question 2

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

Accepted Answer

$$3.15 	ext{ to } 1$$

Question 3

A pea plant with genotype $$Pp ($$where $$P is $$purple and $$p is $$white) is self-pollinated. What fraction of the offspring will have white flowers?

Accepted Answer

$$1/4$$

Question 4

Which statement about alleles is correct according to Mendel's model?

Accepted Answer

Alleles are different versions of a gene found at the same locus on homologous chromosomes.

Question 5

If a plant with genotype $$YyRr ($$yellow, round) is crossed with a plant with genotype $$yyrr ($$green, wrinkled), what proportion of the offspring will have yellow, round seeds? (Assume independent assortment.)

Accepted Answer

$$1/4$$

Question 6

Which of the following best explains why Mendel chose pea plants for his experiments?

Accepted Answer

Pea plants have many easily observable traits and can self-pollinate or be cross-pollinated.

Question 7

A testcross is performed between a purple-flowered pea plant of unknown genotype and a white-flowered plant. If all offspring have purple flowers, what is the genotype of the purple-flowered parent?

Accepted Answer

Homozygous dominant ($$PP)$$

Question 8

Which of the following is an example of a phenotype?

Accepted Answer

Purple flowers in a pea plant

Question 9

According to Mendel's Law of Independent Assortment, which of the following is true?

Accepted Answer

Alleles for different genes assort independently if they are on different chromosomes.

Question 10

In a dihybrid cross between two heterozygous plants ($$YyRr 	imes YyRr$$), what is the expected phenotypic ratio among the offspring?

Accepted Answer

$$9:3:3:1$$

Question 11

If Mendel had stopped his experiments after the F1 generation, what incorrect conclusion might he have drawn?

Accepted Answer

All offspring inherit a mix of parental traits, supporting the blending hypothesis.

Question 12

Which of the following best describes a homozygous genotype?

Accepted Answer

An organism with two identical alleles for a gene

Question 13

A plant with genotype $$Pp is $$crossed with another $$Pp$$ plant. What is the probability that an offspring will be homozygous recessive?

Accepted Answer

$$1/4$$

Question 14

Which of the following statements about dominant and recessive alleles is correct?

Accepted Answer

A dominant allele determines the organism's phenotype even if only one copy is present.

Question 15

In Mendel's experiments, what was the genotypic ratio among the F2 generation for a monohybrid cross?

Accepted Answer

$$1:2:1$$

Question 16

Which of the following best explains the difference between genotype and phenotype?

Accepted Answer

Genotype refers to the genetic makeup, while phenotype refers to the observable traits.

Question 17

A plant with genotype $$YY is $$crossed with a plant with genotype $$yy. $$What will be the genotype of all F1 offspring?

Accepted Answer

$$Yy$$

Question 18

Which of the following is a real-world application of Mendel's principles of inheritance?

Accepted Answer

Predicting the likelihood of inheriting genetic diseases in humans

Question 19

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

Accepted Answer

$$1/2$$

Question 20

Which of the following best describes the Law of Independent Assortment as demonstrated by Mendel's dihybrid crosses?

Accepted Answer

Alleles for different traits segregate independently during gamete formation.

11.1

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