Question 1

In a particular species of plants,flower color is dimorphic: some individuals have red flowers,whereas others have yellow flowers.If flower color is controlled by a single gene with two alleles (cred and cyellow):
a)what would be the simplest way to determine which allele is dominant?
b)what will be the genotypic ratio in the offspring of a cross between a monohybrid and a pure-breeding individual?

Accepted Answer

a)Crossing a pure-breeding red to a pure...

Question 2

A young woman is worried about having a child because her mother's only sister had a son with Duchenne muscular dystrophy (DMD).The young woman has no brothers or sisters.(DMD is a rare X-linked recessive disorder.)
a)Draw the relevant parts of the pedigree of the family described above.(Be sure to include the grandmother,the three women mentioned,and all their mates.)
b)State the most likely genotype of everyone in the pedigree.
c)Calculate the probability that the young woman's first child will have DMD.

Accepted Answer

a)pedigree and b)genotypes

_TB3928_00
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Question 3

"Dumpy" is a commonly used mutant phenotype in the nematode worm C.elegans.Two "Dumpy" individuals are crossed to each other,and this cross produces 210 "Dumpy" and 68 wild-type individuals.If one of the "Dumpy" individuals used in this cross was mated with a wild type,what "Dumpy": wild-type ratio would we observe in the offspring?

Accepted Answer

A)  0:1
B)  1:0
C)  1:1
D)  1:3
E)  3:1

Question 4

What is the probability that individual A is a heterozygous with respect to the condition depicted in the pedigree?

Accepted Answer

A)  0%
B)  25%
C)  50%
D)  75%
E)  100%

Question 5

The following pedigree depicts the inheritance of a rare hereditary disease affecting muscles.  What is the most likely mode of inheritance of this disease?

Accepted Answer

A)  autosomal dominant
B)  autosomal recessive
C)  X-linked dominant
D)  X-linked recessive
E)  Y-linked

Question 6

You have three jars of gumballs.The first jar has 100 white gumballs and 25 green,the second jar has 50 white and 150 blue,and the third jar contains 500 white and 10 red. If you randomly draw one gumball from each jar,what is the probability for   at least one white gumball? 	extbf{      at least one white gumball?   } at least one white gumball?

Accepted Answer

A)  0) 997 or 99.7%
B)  0) 85 or 85%
C)  0) 69 or 69 %
D)  0) 034 or 3.4%
E)  This is impossible (0% chance) .

Question 7

You have three jars of gumballs.The first jar has 100 white gumballs and 25 green,the second jar has 50 white and 150 blue,and the third jar contains 500 white and 10 red. If you randomly draw one gumball from each jar,what is the probability for   all white OR all colored gumballs? 	extbf{     all white OR all colored gumballs?   } all white OR all colored gumballs?

Accepted Answer

A)  0) 199 or 19.9%
B)  0) 112 or 11.2%
C)  0) 058 or 5.8%
D)  0) 589 or 58.9%
E)  This is impossible (0% chance) .

Question 8

A very common type of red-green colorblindness in humans is caused by a mutation in a gene located on the X chromosome.Knowing that the mutant allele is recessive to the wild type,what is the probability that the son of a woman whose father is colorblind is going to also be colorblind?

Accepted Answer

A)  0%
B)  25%
C)  50%
D)  75%
E)  100%

Question 9

A female rabbit of phenotype c′ is crossed to a male rabbit with cch.The F1 is comprised of five rabbits with a c′ phenotype,two with cch phenotype,and three with c phenotype.Of the phenotypically c rabbits,two are females and are backcrossed to their father.This cross produces only rabbits with cch phenotype.These results suggest that:

Accepted Answer

A)  c could be dominant or recessive to c′.
B)  c is dominant to c′,but recessive to cch.
C)  c is dominant to cch,but recessive to c′.
D)  c is dominant to both c′ and cch.
E)  c is recessive to both c′ and cch.

Question 10

Yellow leaves on a plant can be caused by genetic mutations,viruses,or unfavorable environmental conditions.Suppose you find a plant that has yellow leaves,and you want to determine if the cause of the phenotype is a genetic mutation or an environmental stress.Design an experiment to differentiate between the different possibilities.

Accepted Answer

Cross the yellow plant with a normal pla...

Question 11

Mice (Mus musculus) have 40 chromosomes per diploid cell (2n = 40) .How many double- stranded DNA molecules and how many chromosomes are there in a mouse cell that is in the G2 stage of the cell cycle?

Accepted Answer

A)  40 DNA molecules and 20 chromosomes
B)  40 DNA molecules and 40 chromosomes
C)  40 DNA molecules and 80 chromosomes
D)  80 DNA molecules and 40 chromosomes
E)  80 DNA molecules and 80 chromosomes

Exam 2: Single-Gene Inheritance

What is the probability that individual A is a heterozygous with respect to the condition depicted in the pedigree?

Correct Answer
verified

Correct Answer
verified
Cross the yellow plant with a normal pla...
View Answer

Mice (Mus musculus) have 40 chromosomes per diploid cell (2n = 40) .How many double- stranded DNA molecules and how many chromosomes are there in a mouse cell that is in the G2 stage of the cell cycle?

Correct Answer
verified

Correct Answer
verified

You have three jars of gumballs.The first jar has 100 white gumballs and 25 green,the second jar has 50 white and 150 blue,and the third jar contains 500 white and 10 red. If you randomly draw one gumball from each jar,what is the probability for $\textbf{ at least one white gumball? }$

Correct Answer
verified

The following pedigree depicts the inheritance of a rare hereditary disease affecting muscles. What is the most likely mode of inheritance of this disease?

Correct Answer
verified

Correct Answer
verified
a)Crossing a pure-breeding red to a pure...
View Answer

Correct Answer
verified
a)pedigree and b)genotypes
_TB3928_00
...
View Answer

You have three jars of gumballs.The first jar has 100 white gumballs and 25 green,the second jar has 50 white and 150 blue,and the third jar contains 500 white and 10 red. If you randomly draw one gumball from each jar,what is the probability for $\textbf{ all white OR all colored gumballs? }$

Correct Answer
verified

A very common type of red-green colorblindness in humans is caused by a mutation in a gene located on the X chromosome.Knowing that the mutant allele is recessive to the wild type,what is the probability that the son of a woman whose father is colorblind is going to also be colorblind?

Correct Answer
verified

Correct Answer
verified

Exam 2: Single-Gene Inheritance

What is the probability that individual A is a heterozygous with respect to the condition depicted in the pedigree?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedCross the yellow plant with a normal pla...View AnswerShow Answer

Mice (Mus musculus) have 40 chromosomes per diploid cell (2n = 40) .How many double- stranded DNA molecules and how many chromosomes are there in a mouse cell that is in the G2 stage of the cell cycle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The following pedigree depicts the inheritance of a rare hereditary disease affecting muscles. What is the most likely mode of inheritance of this disease?

Correct AnswerverifiedShow Answer

Correct Answerverifieda)Crossing a pure-breeding red to a pure...View AnswerShow Answer

Correct Answerverifieda)pedigree and b)genotypes _TB3928_00 ...View AnswerShow Answer

Correct AnswerverifiedShow Answer

A very common type of red-green colorblindness in humans is caused by a mutation in a gene located on the X chromosome.Knowing that the mutant allele is recessive to the wild type,what is the probability that the son of a woman whose father is colorblind is going to also be colorblind?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Cross the yellow plant with a normal pla...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a)Crossing a pure-breeding red to a pure...
View Answer

Correct Answer
verified
a)pedigree and b)genotypes
_TB3928_00
...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified