Question 1

A couple have a child with Tay-Sachs disease.What is (are)their genotype(s)?

Accepted Answer

A)  both are heterozygous 
B)  one is homozgous dominant and the other is homozgous recessive 
C)  both are homozygous dominant 
D)  both are homozygous recessive 
E)  more than one of these is possible 
A)  both are heterozygous 
B)  one is homozgous dominant and the other is homozgous recessive 
C)  both are homozygous dominant 
D)  both are homozygous recessive 
E)  more than one of these is possible

Question 2

An individual would develop cystic fibrosis if he carries ____ mutated CFTR gene(s).

Accepted Answer

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

Question 3

Which of the following was Mendel's experimental organism?

Accepted Answer

A)  pea plants 
B)  mustard plants 
C)  tobacco plants 
D)  corn plants 
E)  bean plants 
A)  pea plants 
B)  mustard plants 
C)  tobacco plants 
D)  corn plants 
E)  bean plants

Question 4

Which of the following processes is closely associated with the normal functioning of the "cystic fibrosis" gene?

Accepted Answer

A)  water osmosis 
B)  sodium - chloride pumping 
C)  protein diffusion 
D)  pH regulation 
E)  polypeptide packaging 
A)  water osmosis 
B)  sodium - chloride pumping 
C)  protein diffusion 
D)  pH regulation 
E)  polypeptide packaging

Question 5

Females are less likely to have an X-linked recessive disorder than males because

Accepted Answer

A)  there are fewer girls than boys in the general population. 
B)  females have two X chromosomes thus the probability is lower. 
C)  in males, the Y chromosome causes X genes to mutate. 
D)  X-linked recessive disorders are lethal to female embryos. 
E)  X chromosomes have protector genes that protect against mutations thus with two Xs, females have twice the protection as males. 
A)  there are fewer girls than boys in the general population. 
B)  females have two X chromosomes thus the probability is lower. 
C)  in males, the Y chromosome causes X genes to mutate. 
D)  X-linked recessive disorders are lethal to female embryos. 
E)  X chromosomes have protector genes that protect against mutations thus with two Xs, females have twice the protection as males.

Question 6

If tall (D)is dominant to dwarf (d),and two homozygous varieties DD and dd are crossed,then what kind of progeny will be produced?

Accepted Answer

A)  all intermediate forms 
B)  all tall 
C)  all dwarf 
D)  1/2 tall, 1/2 dwarf 
E)  3/4 tall, 1/4 dwarf 
A)  all intermediate forms 
B)  all tall 
C)  all dwarf 
D)  1/2 tall, 1/2 dwarf 
E)  3/4 tall, 1/4 dwarf

Question 7

If a single nondisjunction occurs during anaphase II of meiosis in a normal male cell from meiosis I,of the resulting sperm,

Accepted Answer

A)  three would be normal and one would have an extra chromosome. 
B)  two would be normal, one would have an extra chromosome, and one would be missing a chromosome. 
C)  two would have an extra chromosome and two would be missing a chromosome. 
D)  all four sperm would have an extra chromosome. 
E)  three would have an extra chromosome and one would be normal. 
A)  three would be normal and one would have an extra chromosome. 
B)  two would be normal, one would have an extra chromosome, and one would be missing a chromosome. 
C)  two would have an extra chromosome and two would be missing a chromosome. 
D)  all four sperm would have an extra chromosome. 
E)  three would have an extra chromosome and one would be normal.

Question 8

If all the offspring of a cross had the genotype AaBb,the parents of the cross would most likely be

Accepted Answer

A)  AABB × aabb. 
B)  AAbb × aaBB. 
C)  AaBb × AaBb. 
D)  Aabb × aaBb. 
E)  AABB × aabb or AAbb × aaBB. 
A)  AABB × aabb. 
B)  AAbb × aaBB. 
C)  AaBb × AaBb. 
D)  Aabb × aaBb. 
E)  AABB × aabb or AAbb × aaBB.

Question 9

In an autosomal dominant disorder such as Huntington's,two carrier parents have the probability of passing the gene on to ____ percent of their children.

Accepted Answer

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

Question 10

Which of the following represents an monohybrid cross?

Accepted Answer

A)  AA x aa 
B)  Aa x Aa 
C)  AA x AA 
D)  aa x aa 
E)  all of these are monohybrid crosses 
A)  AA x aa 
B)  Aa x Aa 
C)  AA x AA 
D)  aa x aa 
E)  all of these are monohybrid crosses

Question 11

Purple flower (A)is dominant over white flower (a),and tall stem (B)is dominant over short stem (b).The Punnett square represents a cross between two dihybrids (AaBb × AaBb).
Examine the figure above,and answer the following question(s).
-In the figure above,how many plants would have white flowers and short stems?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  9 
E)  16 
A)  1 
B)  3 
C)  5 
D)  9 
E)  16

Question 12

Which of the following is true of the mutation that causes cystic fibrosis?

Accepted Answer

A)  it is an insertion mutation 
B)  the protein produced is normal 
C)  the protein produced is prevented from reaching the cell surface 
D)  the protein produced instead of being transported into the nucleus is transported into the Golgi body 
E)  more than one of these is true 
A)  it is an insertion mutation 
B)  the protein produced is normal 
C)  the protein produced is prevented from reaching the cell surface 
D)  the protein produced instead of being transported into the nucleus is transported into the Golgi body 
E)  more than one of these is true

Question 13

If R is dominant to r,the offspring of the cross of RR with rr will

Accepted Answer

A)  have a unique phenotype. 
B)  have the same phenotype as the RR parents. 
C)  have the same phenotype as the rr parents. 
D)  have the same genotype as the RR parents. 
E)  have the same genotype as the rr parents. 
A)  have a unique phenotype. 
B)  have the same phenotype as the RR parents. 
C)  have the same phenotype as the rr parents. 
D)  have the same genotype as the RR parents. 
E)  have the same genotype as the rr parents.

Question 14

Purple flower (A)is dominant over white flower (a),and tall stem (B)is dominant over short stem (b).The Punnett square represents a cross between two dihybrids (AaBb × AaBb).
Examine the figure above,and answer the following question(s).
-In the figure above,how many plants would have purple flowers and tall stems?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  9 
E)  16 
A)  1 
B)  3 
C)  5 
D)  9 
E)  16

Question 15

Which of the following statements is FALSE?

Accepted Answer

A)  Crossing over tends to reduce the frequency that two linked genes are inherited together. 
B)  Independent assortment of homologous chromosomes during meiosis increases variation. 
C)  Crossing over leads to variation. 
D)  Abnormal number or structure of chromosomes may influence the course of evolution. 
E)  The closer together genes are found on a chromosome, the greater is a chance that crossing over will occur between them. 
A)  Crossing over tends to reduce the frequency that two linked genes are inherited together. 
B)  Independent assortment of homologous chromosomes during meiosis increases variation. 
C)  Crossing over leads to variation. 
D)  Abnormal number or structure of chromosomes may influence the course of evolution. 
E)  The closer together genes are found on a chromosome, the greater is a chance that crossing over will occur between them.

Question 16

Which of the following would be considered a carrier of a sex-linked recessive defect?

Accepted Answer

A)  a man with the defect 
B)  a woman with the defect 
C)  a father of a son with the defect 
D)  the normal daughter whose father had the defect 
E)  a son of two unaffected parents 
A)  a man with the defect 
B)  a woman with the defect 
C)  a father of a son with the defect 
D)  the normal daughter whose father had the defect 
E)  a son of two unaffected parents

Question 17

The methylation and demethylation of regions of DNA triggered by changes in the environment and resulting in phenotypic changes are an example of

Accepted Answer

A)  pleiotropy. 
B)  environmental effects. 
C)  epistasis 
D)  epigenesis. 
E)  more than one of these. 
A)  pleiotropy. 
B)  environmental effects. 
C)  epistasis 
D)  epigenesis. 
E)  more than one of these.

Question 18

If a normal egg is fertilized by a sperm which has an extra chromosome,what will be the chromosomal condition of the zygote?

Accepted Answer

A)  three copies of the affected chromosome and two of all others 
B)  three copies of all chromosomes 
C)  four copies of the affected chromosome and two of all others 
D)  one copy of the affected chromosome and two of all others 
E)  two copies of all of the chromosomes 
A)  three copies of the affected chromosome and two of all others 
B)  three copies of all chromosomes 
C)  four copies of the affected chromosome and two of all others 
D)  one copy of the affected chromosome and two of all others 
E)  two copies of all of the chromosomes

Question 19

Match the following letters to the number with which they best correspond.
 a.genotype
b.heterozygous
c.dihybrid cross
d.pleiotropic
e.codominance
f.epistasis
g.incomplete dominance
h.syndrome
i.continuous variation
j.aneuploidy
-effect in which a trait is influenced by the product of multiple genes

Accepted Answer

The answer of Match the following letters to the number...

Question 20

In cats,short hair (L)is dominant to long hair (l); if a short-haired cat of unknown genotype is crossed with a long-haired animal,and they produce one long-haired and one short-haired kittens,this would indicate that

Accepted Answer

A)  the short-haired cat was pure-breeding. 
B)  the short-haired cat was not pure-breeding. 
C)  the long-haired cat was not pure-breeding. 
D)  the long-haired cat was pure-breeding. 
E)  none of these could be determined with only two offspring. 
A)  the short-haired cat was pure-breeding. 
B)  the short-haired cat was not pure-breeding. 
C)  the long-haired cat was not pure-breeding. 
D)  the long-haired cat was pure-breeding. 
E)  none of these could be determined with only two offspring.

Exam 9: Patterns of Inheritance

A couple have a child with Tay-Sachs disease.What is (are)their genotype(s)?

An individual would develop cystic fibrosis if he carries ____ mutated CFTR gene(s).

Which of the following was Mendel's experimental organism?

Which of the following processes is closely associated with the normal functioning of the "cystic fibrosis" gene?

Females are less likely to have an X-linked recessive disorder than males because

If tall (D)is dominant to dwarf (d),and two homozygous varieties DD and dd are crossed,then what kind of progeny will be produced?

If a single nondisjunction occurs during anaphase II of meiosis in a normal male cell from meiosis I,of the resulting sperm,

If all the offspring of a cross had the genotype AaBb,the parents of the cross would most likely be

In an autosomal dominant disorder such as Huntington's,two carrier parents have the probability of passing the gene on to ____ percent of their children.

Which of the following represents an monohybrid cross?

Which of the following is true of the mutation that causes cystic fibrosis?

If R is dominant to r,the offspring of the cross of RR with rr will

Which of the following statements is FALSE?

Which of the following would be considered a carrier of a sex-linked recessive defect?

The methylation and demethylation of regions of DNA triggered by changes in the environment and resulting in phenotypic changes are an example of

If a normal egg is fertilized by a sperm which has an extra chromosome,what will be the chromosomal condition of the zygote?

Match the following letters to the number with which they best correspond. a.genotype b.heterozygous c.dihybrid cross d.pleiotropic e.codominance f.epistasis g.incomplete dominance h.syndrome i.continuous variation j.aneuploidy -effect in which a trait is influenced by the product of multiple genes

In cats,short hair (L)is dominant to long hair (l); if a short-haired cat of unknown genotype is crossed with a long-haired animal,and they produce one long-haired and one short-haired kittens,this would indicate that

Invitation to Biology

Molecules of Life

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How Cells Reproduce

Biotechnology

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Processes of Evolution

Early Life Forms and the Viruses

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Animal Evolution

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Animal Tissues and Organs

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