Question 1

What is the probability of rolling a die twice and getting a 2 and a 6 in no particular order?

Accepted Answer

A)   1/3
B)   1/4
C)   1/8
D)   1/18
E)   1/36 D

Question 2

Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of event Y occurring is 1 in 5, the probability of both events occurring is ____.

Accepted Answer

A)   (1/4) 2+ (1/5) 2= (1/16)  + (1/25)  = (25/400)  + (16/400)  = 41/400
B)   (1/4)  + (1/5)  = (5/20)  + (4/20)  = 9/20
C)   (1/4) 2(1/5) 2= (1/16) (1/25)  = 1/400
D)   (1/4) (1/5)  = 1/20
E)   (1/4 + 1/5) 2= (5/20 + 4/20) 2= (9/20) 2= 81/400 D

Question 3

Rice plants may be tolerant or intolerant to flooding. A true-breeding tolerant plant was crossed with a true-breeding intolerant plant, creating an F1generation. When plants from the F1generation are crossed to each other, approximately 75% of the resultant F2generation was tolerant to flooding. What does this most likely suggest about the flood-tolerant and flood-intolerant alleles?

Accepted Answer

A)   Multiple alleles control flood-tolerance.
B)   The alleles for flood-tolerance and flood-intolerance are codominant.
C)   The allele for flood-tolerance is incompletely dominant.
D)   The allele for flood-intolerance is dominant, while the allele for flood-tolerance is recessive.
E)   The allele for flood-tolerance is dominant, while the allele for flood-intolerance is recessive. E

Question 4

Characters that have a continuous distribution, such as height, weight, and skin color, are called ____, and the individual genes that control them are known as ____.

Accepted Answer

A)   quantitative phenotypes; quantitative trait markers
B)   quantitative genotypes; quantitative trait loci
C)   quantitative traits; quantitative trait markers
D)   quantitative traits; quantitative trait loci
E)   quantitative markers; quantitative trait markers

Question 5

Your parents are both heterozygous for the recessive disorder phenylketonuria (PKU). What is the probability that you will have the disorder?

Accepted Answer

A)   25%
B)   50%
C)   75%
D)   100%
E)   25% if your three siblings are healthy; 75% if your siblings also have the disorder

Question 6

Your mother has albinism, which is a recessive trait. Your father has cystic fibrosis, which is also a recessive trait. You discover that your new father-in-law has albinism and cystic fibrosis. If neither you nor your spouse has either albinism or cystic fibrosis, what are the odds that your first child will have either albinism or cystic fibrosis, but not both?

Accepted Answer

A)   1/16
B)   3/8
C)   1/8
D)   1/4
E)   0

Question 7

Explain why Mendel's work was groundbreaking.

Accepted Answer

The answer of Explain why Mendel's work was groundbreaking....

Question 8

In pea plants, yellow seed color is dominant to green, and wrinkled seed texture is dominant to smooth. In a dihybrid cross between two heterozygous plants with yellow, round seeds, if the two alleles assort independently, what is/are the predicted phenotypic ratio(s) of the offspring?

Accepted Answer

A)   all are yellow and round
B)   8 yellow and round: 8 green and wrinkled
C)   nine green and wrinkled: four yellow and round: three green and round
D)   nine green and round: three yellow and round: three yellow and wrinkled: one green and wrinkled
E)   nine yellow and round: three green and round: three yellow and wrinkled: one green and wrinkled

Question 9

A cross is performed between parents with genotypes aaBbCc and aaBbcc . What is the probability that the offspring will have the same genotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.

Accepted Answer

A)   1/8
B)   1/4
C)   3/8
D)   3/16
E)   9/16

Question 10

Your mother has albinism, which is a recessive trait. Your father has cystic fibrosis, which is also a recessive trait. You discover that your new father-in-law has albinism and cystic fibrosis. If neither you nor your spouse has either albinism or cystic fibrosis, what are the odds that your first child will have neither albinism nor cystic fibrosis?

Accepted Answer

A)   1/16
B)   3/8
C)   1/8
D)   9/16
E)   0

Question 11

When an individual has two different alleles for a given gene, they are ____ for that gene.

Accepted Answer

A)   heterozygous
B)   homozygous
C)   self-fertilized
D)   self-pollinated
E)   recessive

Question 12

Which notation represents a dihybrid cross?

Accepted Answer

A)   RrMM x Rrmm
B)   RRMM x rrmm
C)   RrMm x RrMm
D)   rrMM x RRmm
E)   RrMm x rrmm

Question 13

You have type A blood (genotype IAi ). Who can you donate blood to in an emergency?

Accepted Answer

A)   type O only
B)   type AB only
C)   type A only
D)   types A and B, not O
E)   types A and AB

Question 14

Which notation represents a testcross? (A "dash" indicates the allele's identity is unknown.)

Accepted Answer

A)   R-MM x R-mm
B)   RRMM x rrmm
C)   R-M- x R-M-
D)   rrMM x RRmm
E)   R-M- x rrmm

Question 15

A man and woman are each heterozygous for the autosomal recessive disorder cystic fibrosis. If they want to have three children, what is the probability that only one of the children will have cystic fibrosis?

Accepted Answer

A)   1/4
B)   3/4
C)   9/16
D)   9/64
E)   27/64

Question 16

A plant of genotype CCdd is crossed to a plant of genotype ccDD; the F1offspring are then testcrossed to a ccdd plant. If the genes are on different chromosomes, what percentage of the offspring will be ccdd ?

Accepted Answer

A)   10
B)   20
C)   25
D)   30
E)   50

Question 17

The site on a chromosome where a gene is located is called its ____.

Accepted Answer

A)   character
B)   marker
C)   locus
D)   trait
E)   homologue

Question 18

A couple wants to start a family, but they are concerned that their child might have cystic fibrosis. After taking a family history, you determine that while neither of them has the disease, the woman had a sister with cystic fibrosis (with unaffected parents), and the man's father also had cystic fibrosis. What do you tell them?

Accepted Answer

The answer of A couple wants to start a family,...

Question 19

In ____, genes at one locus mask the effect of genes at another locus.

Accepted Answer

A)   incomplete dominance
B)   codominance
C)   epistasis
D)   polygenic inheritance
E)   pleiotropy

Question 20

In pea plants, round pea texture is dominant over wrinkled texture. How can you obtain true-breeding pea plants having round peas with the least amount of work?

Accepted Answer

A)   Cross plants having round peas with plants having wrinkled peas. Select round pea plants from the progeny because they are now true-breeding.
B)   Cross plants having round peas with other plants having round peas. Do this for multiple generations.
C)   Cross plants having round peas with plants having wrinkled peas. Select round pea plants from the progeny and do a testcross to determine which parental plants were homozygous dominant.
D)   Cross plants having round peas with plants having wrinkled peas. This will tell you which round pea plants are homozygous dominant and are thus true-breeding.
E)   It's not possible. You can only get true-breeding plants that have wrinkled peas.

Exam 12: Mendel, Genes, and Inheritance

What is the probability of rolling a die twice and getting a 2 and a 6 in no particular order?

Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of event Y occurring is 1 in 5, the probability of both events occurring is ____.

Characters that have a continuous distribution, such as height, weight, and skin color, are called , and the individual genes that control them are known as .

Your parents are both heterozygous for the recessive disorder phenylketonuria (PKU) . What is the probability that you will have the disorder?

Explain why Mendel's work was groundbreaking.

In pea plants, yellow seed color is dominant to green, and wrinkled seed texture is dominant to smooth. In a dihybrid cross between two heterozygous plants with yellow, round seeds, if the two alleles assort independently, what is/are the predicted phenotypic ratio(s) of the offspring?

A cross is performed between parents with genotypes aaBbCc and aaBbcc . What is the probability that the offspring will have the same genotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.

When an individual has two different alleles for a given gene, they are ____ for that gene.

Which notation represents a dihybrid cross?

You have type A blood (genotype I^Ai ) . Who can you donate blood to in an emergency?

Which notation represents a testcross? (A "dash" indicates the allele's identity is unknown.)

A man and woman are each heterozygous for the autosomal recessive disorder cystic fibrosis. If they want to have three children, what is the probability that only one of the children will have cystic fibrosis?

A plant of genotype CCdd is crossed to a plant of genotype ccDD; the F₁offspring are then testcrossed to a ccdd plant. If the genes are on different chromosomes, what percentage of the offspring will be ccdd ?

The site on a chromosome where a gene is located is called its ____.

In ____, genes at one locus mask the effect of genes at another locus.

In pea plants, round pea texture is dominant over wrinkled texture. How can you obtain true-breeding pea plants having round peas with the least amount of work?

Exam 12: Mendel, Genes, and Inheritance

What is the probability of rolling a die twice and getting a 2 and a 6 in no particular order?

Events X and Y are independent of each other. If the probability of event X occurring is 1 in 4, and the probability of event Y occurring is 1 in 5, the probability of both events occurring is ____.

Characters that have a continuous distribution, such as height, weight, and skin color, are called ____, and the individual genes that control them are known as ____.

Your parents are both heterozygous for the recessive disorder phenylketonuria (PKU) . What is the probability that you will have the disorder?

Explain why Mendel's work was groundbreaking.

In pea plants, yellow seed color is dominant to green, and wrinkled seed texture is dominant to smooth. In a dihybrid cross between two heterozygous plants with yellow, round seeds, if the two alleles assort independently, what is/are the predicted phenotypic ratio(s) of the offspring?

A cross is performed between parents with genotypes aaBbCc and aaBbcc . What is the probability that the offspring will have the same genotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.

When an individual has two different alleles for a given gene, they are ____ for that gene.

Which notation represents a dihybrid cross?

You have type A blood (genotype IAi ) . Who can you donate blood to in an emergency?

Which notation represents a testcross? (A "dash" indicates the allele's identity is unknown.)

A man and woman are each heterozygous for the autosomal recessive disorder cystic fibrosis. If they want to have three children, what is the probability that only one of the children will have cystic fibrosis?

A plant of genotype CCdd is crossed to a plant of genotype ccDD; the F1offspring are then testcrossed to a ccdd plant. If the genes are on different chromosomes, what percentage of the offspring will be ccdd ?

The site on a chromosome where a gene is located is called its ____.

In ____, genes at one locus mask the effect of genes at another locus.

In pea plants, round pea texture is dominant over wrinkled texture. How can you obtain true-breeding pea plants having round peas with the least amount of work?

Characters that have a continuous distribution, such as height, weight, and skin color, are called , and the individual genes that control them are known as .

You have type A blood (genotype I^Ai ) . Who can you donate blood to in an emergency?

A plant of genotype CCdd is crossed to a plant of genotype ccDD; the F₁offspring are then testcrossed to a ccdd plant. If the genes are on different chromosomes, what percentage of the offspring will be ccdd ?