Question 1

If a genotype of an organism is YySsTt,then what does yST represent?

Accepted Answer

A) a possible phenotype of the offspring 
B) a possible zygote 
C) the P-generation 
D) the genotype of the offspring 
E) a possible gamete of the parent 
A) a possible phenotype of the offspring 
B) a possible zygote 
C) the P-generation 
D) the genotype of the offspring 
E) a possible gamete of the parent

Question 2

Which of the following disorders is caused by individuals lacking an enzyme which is needed to break down the amino acid phenylalanine,and if not treated with a proper diet avoiding phenylalanine,severe mental retardation occurs?

Accepted Answer

A) Tay-Sachs disease 
B) PKU 
C) Cystic fibrosis 
D) Huntington disease 
E) Sickle-cell disease 
A) Tay-Sachs disease 
B) PKU 
C) Cystic fibrosis 
D) Huntington disease 
E) Sickle-cell disease

Question 3

Mendel's law of segregation implies that the two members of an allelic pair

Accepted Answer

A) are segregated pair wise. 
B) are distributed to the same gamete. 
C) are distributed to separate gametes. 
D) are always code for the identical trait or feature. 
E) are assorted dependently. 
A) are segregated pair wise. 
B) are distributed to the same gamete. 
C) are distributed to separate gametes. 
D) are always code for the identical trait or feature. 
E) are assorted dependently.

Question 4

Which of the following was a contribution Thomas Hunt Morgan made to genetics?

Accepted Answer

A) He discovered the law of independent assortment. 
B) He showed that genes are in a particular order along the chromosome. 
C) He discovered the law of segregation. 
D) He discovered polygenic inheritance. 
E) He showed how X-linked disorders are inherited. 
A) He discovered the law of independent assortment. 
B) He showed that genes are in a particular order along the chromosome. 
C) He discovered the law of segregation. 
D) He discovered polygenic inheritance. 
E) He showed how X-linked disorders are inherited.

Question 5

Figure:  
-This figure shows a human pedigree.What is the genotype of the person indicated by a clear square?

Accepted Answer

A) homozygous recessive only 
B) could be homozygous recessive or heterozygous 
C) homozygous dominant only 
D) could be homozygous dominant or heterozygous 
E) heterozygous only 
A) homozygous recessive only 
B) could be homozygous recessive or heterozygous 
C) homozygous dominant only 
D) could be homozygous dominant or heterozygous 
E) heterozygous only

Question 6

If a woman is a carrier for the X-linked recessive colorblindness and her husband is normal,what are their chances that a son will be colorblind?

Accepted Answer

A) 25%,since the mother is a carrier 
B) 100% because the mother has the gene 
C) 50%,since the mother is a carrier 
D) None,since the father is normal 
E) None,since he will be also a carrier 
A) 25%,since the mother is a carrier 
B) 100% because the mother has the gene 
C) 50%,since the mother is a carrier 
D) None,since the father is normal 
E) None,since he will be also a carrier

Question 7

When two different dominant alleles are both fully expressed in the phenotype,it is referred to as

Accepted Answer

A) incomplete dominance. 
B) codominance. 
C) genotype dominance. 
D) polygenic dominance. 
E) pleiotropic dominancE. 
A) incomplete dominance. 
B) codominance. 
C) genotype dominance. 
D) polygenic dominance. 
E) pleiotropic dominancE.

Question 8

Figure:  
-This figure shows a human pedigree.What is the genotype of the mother in this pedigree?

Accepted Answer

A) could be homozygous recessive or heterozygous 
B) heterozygous only 
C) homozygous recessive only 
D) homozygous dominant only 
E) could be homozygous dominant or heterozygous 
A) could be homozygous recessive or heterozygous 
B) heterozygous only 
C) homozygous recessive only 
D) homozygous dominant only 
E) could be homozygous dominant or heterozygous

Question 9

Both parents are heterozygous for the autosomal recessive Tay-Sachs disease.If three children in a row were born with Tay-Sachs disease,what are the chances that the next child will have Tay-Sachs disease?

Accepted Answer

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

Question 10

Figure:
Use the following figure to answer question.  
-This figure shows a dihybrid cross.What does "e" represent?

Accepted Answer

A) ttgg 
B) TtgG 
C) TtGg 
D) TTGG 
E) TTgg 
A) ttgg 
B) TtgG 
C) TtGg 
D) TTGG 
E) TTgg

Question 11

Figure:
Use the following figure to answer question.  
-This figure shows a dihybrid cross.What does "c" represent?

Accepted Answer

A) short plant,yellow pod 
B) tall plant,yellow pod 
C) tall plant,green pod 
D) short plant,green pod 
E) short plant,purple pod 
A) short plant,yellow pod 
B) tall plant,yellow pod 
C) tall plant,green pod 
D) short plant,green pod 
E) short plant,purple pod

Question 12

-This figure shows a human pedigree.What is the genotype of the youngest members of the family (bottom row)?

Accepted Answer

A) could be either homozygous dominant or heterozygous 
B) homozygous dominant 
C) could be either homozygous recessive or heterozygous 
D) homozygous recessive 
E) heterozygous 
A) could be either homozygous dominant or heterozygous 
B) homozygous dominant 
C) could be either homozygous recessive or heterozygous 
D) homozygous recessive 
E) heterozygous

Question 13

A plant with yellow flowers was crossed with a plant with red flowers.All of the numerous offspring had red flowers.What does this show about the genotype of the parental plant with yellow flowers?

Accepted Answer

A) It is homozygous dominant. 
B) It is homozygous dominant or heterozygous. 
C) It is heterozygous dominant. 
D) It is homozygous recessive or heterozygous. 
E) It is homozygous recessivE. 
A) It is homozygous dominant. 
B) It is homozygous dominant or heterozygous. 
C) It is heterozygous dominant. 
D) It is homozygous recessive or heterozygous. 
E) It is homozygous recessivE.

Question 14

A testcross occurs when an individual with the _____________ is crossed with an individual having the ______________.

Accepted Answer

A) homozygous dominant,heterozygous recessive 
B) dominant phenotype,dominant phenotype 
C) dominant phenotype,recessive phenotype 
D) heterozygous dominant,homozygous recessive 
E) homozygous recessive,homozygous recessive 
A) homozygous dominant,heterozygous recessive 
B) dominant phenotype,dominant phenotype 
C) dominant phenotype,recessive phenotype 
D) heterozygous dominant,homozygous recessive 
E) homozygous recessive,homozygous recessive

Question 15

If pairs of factors separate independently of other pairs of factors,you are dealing with the

Accepted Answer

A) law of independent assortment 
B) law of codominance 
C) law of dominance 
D) law of segregation 
E) law of multiple alleles 
A) law of independent assortment 
B) law of codominance 
C) law of dominance 
D) law of segregation 
E) law of multiple alleles

Question 16

Because genes close together on a chromosome tend to be inherited together,they are said to form a

Accepted Answer

A) pleiotropic association. 
B) linkage group. 
C) genotype association. 
D) gene locus. 
E) polygenic group. 
A) pleiotropic association. 
B) linkage group. 
C) genotype association. 
D) gene locus. 
E) polygenic group.

Question 17

If an organism shows a recessive phenotype,such as short pea plants,it can be

Accepted Answer

A) either TT or Tt. 
B) only tt. 
C) either TT or tt. 
D) only TT. 
E) only Tt. 
A) either TT or Tt. 
B) only tt. 
C) either TT or tt. 
D) only TT. 
E) only Tt.

Question 18

Figure:
Use the following figure to answer question.  
-This figure shows a dihybrid cross.What does "a" represent?

Accepted Answer

A) TTgg 
B) TTGG 
C) ttgG 
D) ttgg 
E) ttGg 
A) TTgg 
B) TTGG 
C) ttgG 
D) ttgg 
E) ttGg

Question 19

Genetic crosses which involve two traits are referred to as phenotypic crosses.

Accepted Answer

A) True 
 B)False

Question 20

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.What would be the expected results if a BbSs mated with a BbSs?

Accepted Answer

A) 9 black short hair,6 black long hair,3 brown long hair,1 black short hair 
B) 9 black short hair,3 black long hair,3 brown short hair,1 brown long hair 
C) 9 black long hair,3 black short hair,3 brown long hair,1 brown short hair 
D) 9 brown short hair,3 black long hair,3 brown long hair,1 brown short hair 
E) 6 black short hair,6 black long hair,2 brown short hair,2 brown long hair 
A) 9 black short hair,6 black long hair,3 brown long hair,1 black short hair 
B) 9 black short hair,3 black long hair,3 brown short hair,1 brown long hair 
C) 9 black long hair,3 black short hair,3 brown long hair,1 brown short hair 
D) 9 brown short hair,3 black long hair,3 brown long hair,1 brown short hair 
E) 6 black short hair,6 black long hair,2 brown short hair,2 brown long hair

Exam 10: Patterns of Genetic Inheritance

If a genotype of an organism is YySsTt,then what does yST represent?

Which of the following disorders is caused by individuals lacking an enzyme which is needed to break down the amino acid phenylalanine,and if not treated with a proper diet avoiding phenylalanine,severe mental retardation occurs?

Mendel's law of segregation implies that the two members of an allelic pair

Which of the following was a contribution Thomas Hunt Morgan made to genetics?

Figure: -This figure shows a human pedigree.What is the genotype of the person indicated by a clear square?

If a woman is a carrier for the X-linked recessive colorblindness and her husband is normal,what are their chances that a son will be colorblind?

When two different dominant alleles are both fully expressed in the phenotype,it is referred to as

Figure: -This figure shows a human pedigree.What is the genotype of the mother in this pedigree?

Both parents are heterozygous for the autosomal recessive Tay-Sachs disease.If three children in a row were born with Tay-Sachs disease,what are the chances that the next child will have Tay-Sachs disease?

Figure: Use the following figure to answer question. -This figure shows a dihybrid cross.What does "e" represent?

Figure: Use the following figure to answer question. -This figure shows a dihybrid cross.What does "c" represent?

-This figure shows a human pedigree.What is the genotype of the youngest members of the family (bottom row)?

A plant with yellow flowers was crossed with a plant with red flowers.All of the numerous offspring had red flowers.What does this show about the genotype of the parental plant with yellow flowers?

A testcross occurs when an individual with the _____________ is crossed with an individual having the ______________.

If pairs of factors separate independently of other pairs of factors,you are dealing with the

Because genes close together on a chromosome tend to be inherited together,they are said to form a

If an organism shows a recessive phenotype,such as short pea plants,it can be

Figure: Use the following figure to answer question. -This figure shows a dihybrid cross.What does "a" represent?

Genetic crosses which involve two traits are referred to as phenotypic crosses.

In guinea pigs,B = black,b = brown,S = short hair,s = long hair.What would be the expected results if a BbSs mated with a BbSs?

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A testcross occurs when an individual with the _ is crossed with an individual having the __.