Question 1

In complementary gene action,dominant alleles of two or more genes are required to generate a particular trait.

Accepted Answer

A) True 
 B)False  True

Question 2

The sum rule states that the probability of both of two mutually exclusive events occurring is the sum of their individual probabilities.

Accepted Answer

A) True 
 B)False  False

Question 3

The mating of parents with antagonistic traits produces hybrids.

Accepted Answer

A) True 
 B)False  True

Question 4

Several alleles at several different loci all contribute additively to the same trait.Therefore,for this trait:

Accepted Answer

A)  homozygotes cannot exist 
B)  heterozygotes cannot exist 
C)  only one phenotypic class is possible 
D)  only two phenotypic classes are possible 
E)  continuous variation may be observed 
A)  homozygotes cannot exist 
B)  heterozygotes cannot exist 
C)  only one phenotypic class is possible 
D)  only two phenotypic classes are possible 
E)  continuous variation may be observed

Question 5

In the dihybrid cross AaBb × aabb,what proportion of individuals are expected to be homozygotic for both genes in the F1 generation?

Accepted Answer

A)  1/4 
B)  1/2 
C)  3/4 
D)  All are homozygotes. 
E)  None are homozygotes. 
A)  1/4 
B)  1/2 
C)  3/4 
D)  All are homozygotes. 
E)  None are homozygotes.

Question 6

In Drosophila,forked (fk)bristles are recessive to normal (fk+)and glassy eyes (gls)are recessive to normal (gls+).If a homozygous wild-type male is mated to a forked-bristle,glassy-eye female,predict the genotypes and phenotypes of the F1.

Accepted Answer

Question 7

In corn liguleless, (l)is recessive to ligules (L)and a green leaf (G)is dominant to the normal non-green (g).If a plant homozygous for liguleless and green leaves is crossed to one homozygous for non-green with ligules,predict the phenotypes and genotypes of the F2.

Accepted Answer

Question 8

What does a vertical pattern of inheritance in a pedigree likely indicate?

Accepted Answer

A)  rare recessive trait 
B)  rare dominant trait 
C)  mulitgenic inheritance 
D)  environmental impact 
E)  common recessive trait 
A)  rare recessive trait 
B)  rare dominant trait 
C)  mulitgenic inheritance 
D)  environmental impact 
E)  common recessive trait

Question 9

Rosy coloured eyes and forked bristles are unlinked,recessive traits in Drosophila.A rosy-eyed Drosophila with wild-type bristles was crossed with a forked Drosophila with wild-type eyes.All of the F1 were phenotypically wild-type for both traits,whereas the F2 consisted of 306 wild-type,94 rosy-eyed,102 fork-bristled,and 33 forked-bristled and rosy-eyed flies.Infer the genotypes of the parents.

Accepted Answer

A)  rrff,RRFF 
B)  Rrff,rrFf 
C)  RRFF,RRFF 
D)  rrff,rrff 
E)  RRff,rrFF 
A)  rrff,RRFF 
B)  Rrff,rrFf 
C)  RRFF,RRFF 
D)  rrff,rrff 
E)  RRff,rrFF

Question 10

The phenotypic ratio 9:7 may indicate

Accepted Answer

A)  complete dominance. 
B)  codominance. 
C)  epistasis. 
D)  recessive lethal. 
E)  complementary gene action. 
A)  complete dominance. 
B)  codominance. 
C)  epistasis. 
D)  recessive lethal. 
E)  complementary gene action.

Question 11

Assuming independent assortment,which of the crosses below will produce a 1:1 phenotypic ratio among the F1 progeny?

Accepted Answer

A)  AABB × aabb 
B)  AaBb × AaBb 
C)  AaBb × aabb 
D)  AaBB × aaBB 
E)  AAbb × aaBB 
A)  AABB × aabb 
B)  AaBb × AaBb 
C)  AaBb × aabb 
D)  AaBB × aaBB 
E)  AAbb × aaBB

Question 12

In a certain breed of plants,dark green is determined by the dominant gene G and light green is determined by the recessive gene g.The heterozygote shows 75% penetrance for the dominant phenotype.If the parental cross is GG × gg,what phenotype distribution would be expected in a population of 400 F2 plants?

Accepted Answer

250 dark green (GG +

Question 13

A person who has type O blood has

Accepted Answer

A)  anti-A antibodies. 
B)  anti-B antibodies. 
C)  anti-AB antibodies. 
D)  both anti-A and -B antibodies. 
E)  no surface antigens. 
A)  anti-A antibodies. 
B)  anti-B antibodies. 
C)  anti-AB antibodies. 
D)  both anti-A and -B antibodies. 
E)  no surface antigens.

Question 14

In rats,the gene for the pigment (P)is dominant to no pigment (p).The gene for black (B)is dominant to the gene for cream (b).If a pigment gene (P)is absent,genes B and b are inoperative.Predict the genotypes and phenotypes of the F2 of a parental cross between a homozygous black rat and an albino homozygous for cream.

Accepted Answer

9 Black;3

Question 15

Assume that in guinea pigs,dark brown fur (B)is dominant to black fur (b).If you mate a homozygous black guinea pig with a homozygous brown guinea pig,what proportion of the progeny will be heterozygous?

Accepted Answer

A)  none 
B)  1/4 
C)  1/2 
D)  3/4 
E)  all 
A)  none 
B)  1/4 
C)  1/2 
D)  3/4 
E)  all

Question 16

In poultry,if a Black Longshank male with feathered shanks is crossed with a Buff Rock female with unfeathered shanks the F1 are all feathered and the F2 show 90 feathered to 6 unfeathered.Infer the genotypes of the parents.

Accepted Answer

AABB × aabb;The ratio i

Question 17

Cross-fertilization is the same as reciprocal cross.

Accepted Answer

A) True 
 B)False

Question 18

The Punnett square was introduced in 1906 by Reginald Punnett and provides a simple and convenient method of tracking possible combinations of gametes that might be produced in a given cross.

Accepted Answer

A) True 
 B)False

Question 19

A deviation from normal Mendelian ratios,which may be resolved by counting and/or controlled crosses,is seen in which of the following terms?

Accepted Answer

A)  pleiotropy 
B)  codominance 
C)  incomplete dominance 
D)  complete dominance 
E)  penetrance and expressivity 
A)  pleiotropy 
B)  codominance 
C)  incomplete dominance 
D)  complete dominance 
E)  penetrance and expressivity

Question 20

What does a diamond symbol ? in a pedigree indicate?

Accepted Answer

The answer of What does a diamond symbol ? in...

In complementary gene action,dominant alleles of two or more genes are required to generate a particular trait.

The sum rule states that the probability of both of two mutually exclusive events occurring is the sum of their individual probabilities.

The mating of parents with antagonistic traits produces hybrids.

Several alleles at several different loci all contribute additively to the same trait.Therefore,for this trait:

In the dihybrid cross AaBb × aabb,what proportion of individuals are expected to be homozygotic for both genes in the F₁ generation?

In Drosophila,forked (fk)bristles are recessive to normal (fk⁺)and glassy eyes (gls)are recessive to normal (gls⁺).If a homozygous wild-type male is mated to a forked-bristle,glassy-eye female,predict the genotypes and phenotypes of the F₁.

In corn liguleless, (l)is recessive to ligules (L)and a green leaf (G)is dominant to the normal non-green (g).If a plant homozygous for liguleless and green leaves is crossed to one homozygous for non-green with ligules,predict the phenotypes and genotypes of the F₂.

What does a vertical pattern of inheritance in a pedigree likely indicate?

The phenotypic ratio 9:7 may indicate

Assuming independent assortment,which of the crosses below will produce a 1:1 phenotypic ratio among the F₁ progeny?

A person who has type O blood has

Assume that in guinea pigs,dark brown fur (B)is dominant to black fur (b).If you mate a homozygous black guinea pig with a homozygous brown guinea pig,what proportion of the progeny will be heterozygous?

In poultry,if a Black Longshank male with feathered shanks is crossed with a Buff Rock female with unfeathered shanks the F₁ are all feathered and the F₂ show 90 feathered to 6 unfeathered.Infer the genotypes of the parents.

Cross-fertilization is the same as reciprocal cross.

The Punnett square was introduced in 1906 by Reginald Punnett and provides a simple and convenient method of tracking possible combinations of gametes that might be produced in a given cross.

A deviation from normal Mendelian ratios,which may be resolved by counting and/or controlled crosses,is seen in which of the following terms?

What does a diamond symbol ? in a pedigree indicate?

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

Linkage, Recombination, and the Mapping of Genes on Chromosomes

Dna Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: the Flow of Information From Dna to Rna to Protein

Digital Analysis of Genomes

Genome Annotation

Analyzing Genomic Variation

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

Genetics of Complex Traits

Exploring Synthetic Biology: Concepts, Techniques, and Applications

Filters

Exam 1: Mendels Principles of Heredity

In complementary gene action,dominant alleles of two or more genes are required to generate a particular trait.

The sum rule states that the probability of both of two mutually exclusive events occurring is the sum of their individual probabilities.

The mating of parents with antagonistic traits produces hybrids.

Several alleles at several different loci all contribute additively to the same trait.Therefore,for this trait:

In the dihybrid cross AaBb × aabb,what proportion of individuals are expected to be homozygotic for both genes in the F1 generation?

In Drosophila,forked (fk)bristles are recessive to normal (fk+)and glassy eyes (gls)are recessive to normal (gls+).If a homozygous wild-type male is mated to a forked-bristle,glassy-eye female,predict the genotypes and phenotypes of the F1.

In corn liguleless, (l)is recessive to ligules (L)and a green leaf (G)is dominant to the normal non-green (g).If a plant homozygous for liguleless and green leaves is crossed to one homozygous for non-green with ligules,predict the phenotypes and genotypes of the F2.

What does a vertical pattern of inheritance in a pedigree likely indicate?

The phenotypic ratio 9:7 may indicate

Assuming independent assortment,which of the crosses below will produce a 1:1 phenotypic ratio among the F1 progeny?

A person who has type O blood has

Assume that in guinea pigs,dark brown fur (B)is dominant to black fur (b).If you mate a homozygous black guinea pig with a homozygous brown guinea pig,what proportion of the progeny will be heterozygous?

In poultry,if a Black Longshank male with feathered shanks is crossed with a Buff Rock female with unfeathered shanks the F1 are all feathered and the F2 show 90 feathered to 6 unfeathered.Infer the genotypes of the parents.

Cross-fertilization is the same as reciprocal cross.

The Punnett square was introduced in 1906 by Reginald Punnett and provides a simple and convenient method of tracking possible combinations of gametes that might be produced in a given cross.

A deviation from normal Mendelian ratios,which may be resolved by counting and/or controlled crosses,is seen in which of the following terms?

What does a diamond symbol ? in a pedigree indicate?

Extensions to Mendels Laws

The Chromosome Theory of Inheritance

Linkage, Recombination, and the Mapping of Genes on Chromosomes

Dna Structure, Replication, and Recombination

Anatomy and Function of a Gene: Dissection Through Mutation

Gene Expression: the Flow of Information From Dna to Rna to Protein

Digital Analysis of Genomes

Genome Annotation

Analyzing Genomic Variation

The Eukaryotic Chromosome

Chromosomal Rearrangements and Changes in Chromosome Number

Bacterial Genetics

Organellar Inheritance

Gene Regulation in Prokaryotes

Gene Regulation in Eukaryotes

Manipulating the Genomes of Eukaryotes

The Genetic Analysis of Development

The Genetics of Cancer

Variation and Selection in Populations

Genetics of Complex Traits

Exploring Synthetic Biology: Concepts, Techniques, and Applications

Filters

In the dihybrid cross AaBb × aabb,what proportion of individuals are expected to be homozygotic for both genes in the F₁ generation?

In Drosophila,forked (fk)bristles are recessive to normal (fk⁺)and glassy eyes (gls)are recessive to normal (gls⁺).If a homozygous wild-type male is mated to a forked-bristle,glassy-eye female,predict the genotypes and phenotypes of the F₁.

In corn liguleless, (l)is recessive to ligules (L)and a green leaf (G)is dominant to the normal non-green (g).If a plant homozygous for liguleless and green leaves is crossed to one homozygous for non-green with ligules,predict the phenotypes and genotypes of the F₂.

Assuming independent assortment,which of the crosses below will produce a 1:1 phenotypic ratio among the F₁ progeny?

In poultry,if a Black Longshank male with feathered shanks is crossed with a Buff Rock female with unfeathered shanks the F₁ are all feathered and the F₂ show 90 feathered to 6 unfeathered.Infer the genotypes of the parents.