Question 1

Which of the following best describes the difference between a gene and an allele?

Accepted Answer

A gene is a segment of DNA that codes for a trait, while an allele is a variant form of that gene.

Question 2

In a monohybrid cross between two heterozygous purple-flowered pea plants (Pp x Pp), what is the expected phenotypic ratio of the offspring?

Accepted Answer

$$3:1 ($$purple:white)

Question 3

If a plant with genotype $$PpTt is $$crossed with another $$PpTt$$ plant, what is the probability that an offspring will be homozygous recessive for both traits?

Accepted Answer

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

Question 4

Which of the following best defines a phenotype?

Accepted Answer

The observable physical or physiological traits of an organism.

Question 5

A true-breeding tall plant is crossed with a true-breeding short plant. All offspring are tall. What does this indicate about the tall allele?

Accepted Answer

The tall allele is dominant to the short allele.

Question 6

Which of the following genotypes is considered homozygous?

Accepted Answer

TT

Question 7

In a dihybrid cross, what is the probability of obtaining an offspring with the genotype $$PpTt$$ from parents both with genotype $$PpTt$$?

Accepted Answer

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

Question 8

Which of the following statements about Punnett squares is correct?

Accepted Answer

They predict the probability of offspring genotypes from parental crosses.

Question 9

If the probability of inheriting allele A from one parent is $$0.5$$ and allele B from the other parent is $$0.5$$, what is the probability of inheriting both alleles?

Accepted Answer

$$0.25$$

Question 10

Which of the following best describes a heterozygous genotype?

Accepted Answer

An organism with two different alleles for a gene.

Question 11

A carrier for a recessive genetic disorder is best described as:

Accepted Answer

Heterozygous for the disorder allele but does not show symptoms.

Question 12

Which of the following is true about X-linked traits?

Accepted Answer

They are associated with genes found on the X chromosome.

Question 13

If two events are independent, how do you calculate the probability of both occurring?

Accepted Answer

Multiply the probabilities of each event.

Question 14

Which of the following crosses would produce only heterozygous offspring?

Accepted Answer

Homozygous dominant x homozygous recessive

Question 15

A plant with genotype $$Pp is $$self-fertilized. What is the probability that an offspring will be homozygous dominant?

Accepted Answer

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

Question 16

Which of the following best describes a dihybrid cross?

Accepted Answer

A cross involving two different genes, each with two alleles.

Question 17

If the probability of a child inheriting a dominant trait from one parent is $$0.5$$, and from the other parent is $$0.5$$, what is the probability the child will inherit the dominant trait from both parents?

Accepted Answer

$$0.25$$

Question 18

Which of the following is an example of a genotype?

Accepted Answer

Pp

Question 19

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

Accepted Answer

A dominant allele masks the effect of a recessive allele in a heterozygote.

Question 20

In a cross between two heterozygous tall pea plants ($$Tt x$$ $$Tt$$), what is the probability of producing a short offspring?

Accepted Answer

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

Mendelian Genetics and Meiosis Recap: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드