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Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light.This is an example of


A) a multifactorial trait.
B) polygenic inheritance.
C) pleiotropy.
D) codominance.
E) incomplete dominance.

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Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele.What is the most effective way for Morgan verify this statement?


A) Breed the snake with a heterozygous female.
B) Breed the snake with a homozygous normal female.
C) Breed the snake with a female sibling.
D) Breed the snake with a homozygous recessive albino female.
E) He can breed the snake with any female and a portion of the offspring will always be albino.

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Which genetic disorder is associated with an irregular shape of the red blood cells?


A) Sickle cell disease
B) Marfan syndrome
C) Huntington disease
D) Phenylketonuria (PKU)
E) Cystic fibrosis (CF)

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Red-green colorblindness is a recessive X-linked trait.If a female is red-green colorblind,which of the following is TRUE?


A) Her mother must be colorblind.
B) Both her parents must be colorblind.
C) Both her parents are carriers of the recessive allele.
D) Her father must be colorblind.
E) Women cannot exhibit red-green colorblindness because they have two X chromosomes.

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Alleles A,B,and C are found on the same chromosome with alleles a,b,and c on the homologous chromosome.If alleles A and C on one homologous chromosome,and a and c on the other homologous chromosome are typically inherited together,this suggests that


A) A and C alleles are closer together than the a and c alleles.
B) the order of the alleles on one homologous chromosome is A,B,C.
C) alleles a and c are closer together than alleles c and b.
D) a recombinant gamete would contain alleles A,B,and C.
E) crossing over often occurs between sister chromatids.

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Morgan buys a male python from a snake dealer who tells him that the snake carries the albino allele.Morgan mates the snake with an albino female and four normally pigmented offspring are produced.Morgan rushes back to the snake dealer and demands his money back stating that the male he bought is not heterozygous for the albino allele because all of its offspring had normal pigmentation.


A) True because according to the laws of probability, at least one of the offspring should have been an albino.
B) True because 50% of all offspring produced must be albino.
C) False because for each offspring there is a 50% chance that it will have normal pigmentation.
D) False because a heterozygous male will only pass the dominant allele to its offspring.
E) True because if at least one parent is homozygous recessive, at least one of their offspring must also show the recessive trait.

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A cow with black and white patches is produced from a white bull and a black cow.This is an example of


A) incomplete dominance.
B) codominance.
C) dominance/recessive trait.
D) polygenic.
E) pleiotropy.

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A blue-eyed,left-handed woman marries a brown-eyed,right-handed man who is heterozygous for both of his traits.If blue eyes and left-handedness are recessive,how many different phenotypes are possible in their children?


A) four
B) three
C) two
D) one
E) five

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Which of the following is NOT a correct match?


A) physical expression of a trait - phenotype
B) allele that masks the expression of an alternate allele - dominant
C) identical alleles - heterozygous
D) allele whose expression can be masked by an alternate allele - recessive
E) the specific alleles that an individual has - genotype

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If an individual expresses a dominant disease,which of the following is true?


A) All of his children will always inherit the disease.
B) He will pass this disease to all of his daughters.
C) There is at least a 50% probability that his children will inherit the disease.
D) There is a 100% possibility that his sons will inherit this disease.
E) None of his children will inherit the disease unless his wife also has the disease.

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Which of the following is an example of a phenotype?


A) AAGg
B) freckles
C) AA
D) Ag
E) Gg

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What type of disorder is hemophilia classified as?


A) sex-linked recessive
B) sex-linked dominant
C) co-dominance
D) polygenic
E) pleiotropic

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Which is NOT true according to Mendel's law and meiosis?


A) One factor must be dominant and one factor recessive in each individual.
B) Each individual contains two factors for each trait.
C) Factors separate from each other during gamete formation.
D) Each gamete contains one copy of each factor.
E) Fertilization restores the presence of two factors.

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If a homozygous black bull is mated with a homozygous white cow and the calf is gray,this would be an example of ___________.However,if the calf has black and white spots this would be an example of


A) incomplete dominance; a sex-linked trait.
B) complete dominance; polygenic trait.
C) codominance; homology.
D) incomplete dominance; codominance.
E) a sex-linked trait; a recessive trait.

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In a monohybrid cross,how many traits are examined?


A) 1
B) 2
C) 3
D) 4
E) 5

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How many different gametes can be produced from the genotype AaBBDDEeff?


A) 1
B) 2
C) 4
D) 8
E) 16

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Which of the following is NOT true with regard to the law of segregation?


A) Each individual has 2 factors for each trait.
B) Genes segregate during gamete formation.
C) Gametes contain only 1 gene from each pair.
D) During fertilization, each new individual obtains 2 genes for each trait.
E) Each gamete contains 2 genes for each trait.

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Vitamin-D resistant rickets is a sex-linked dominant trait,which leads to softening of the bones which can cause fractures and deformities.Rickets is often due to a deficiency of vitamin D,however,with vitamin-D resistant rickets,ingestion of vitamin D is ineffective.Maria's mother is normal and does not display any symptoms of this disease; however,Maria's father has the disease.Maria marries a man that does not have the disease.What is the probability that they will have a daughter that has the disease?


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

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A red-eyed male Drosophila mates with a red-eyed female Drosophila.One of the female's parents had white eyes.What proportion of the male offspring will have white eyes?


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

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The filled-in squares of a Punnett square represent


A) the numbers of individuals with each version of a trait.
B) all possible combinations of gametes based on a cross between the two parents.
C) an exact ratio that must always occur when the same parents have 4 offspring.
D) examples of some of the offspring that can arise from a one-trait cross.
E) the gametes from one parent.

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