Question 1

If shape and color of radishes are due to incompletely dominant genes, crossing two dihybrid heterozygotes will produce how many different phenotypes?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 9 
A) 2 
B) 3 
C) 4 
D) 5 
E) 9

Question 2

Which of the following statements is true?

Accepted Answer

A) Darwin did not know what mechanisms were responsible for the variation he saw. 
B) The blending theory of inheritance provides excellent support for evolution. 
C) Darwin received Mendel's paper but did not understand its significance. 
D) The explanation for genetics had no implications for evolution. 
E) All of these are true. 
A) Darwin did not know what mechanisms were responsible for the variation he saw. 
B) The blending theory of inheritance provides excellent support for evolution. 
C) Darwin received Mendel's paper but did not understand its significance. 
D) The explanation for genetics had no implications for evolution. 
E) All of these are true.

Question 3

If all offspring of a cross have the genotype Aa, the parents of the cross are most likely

Accepted Answer

A) AA x aa. 
B) Aa x Aa. 
C) Aa x aa. 
D) AA x Aa. 
E) none of these. 
A) AA x aa. 
B) Aa x Aa. 
C) Aa x aa. 
D) AA x Aa. 
E) none of these.

Question 4

If one pair of alleles exhibits simple dominance while the other pair exhibits incomplete dominance, the F2 phenotype produced from a cross of AA BB with aa bb will produce a __________ ratio.

Accepted Answer

A) 1:1:1:1 
B) 9:3:3:1 
C) 1:4:6:4:1 
D) 1:2:1 
E) 3:6:3:1:2:1 
A) 1:1:1:1 
B) 9:3:3:1 
C) 1:4:6:4:1 
D) 1:2:1 
E) 3:6:3:1:2:1

Question 5

Which of the following is TRUE of melanosomes?

Accepted Answer

A) All people have about the same number of melanosomes. 
B) The color of the melanosome dictates skin color. 
C) Excess sunlight decreases melanin. 
D) White Europeans lack melanosomes. 
E) All of these are true. 
A) All people have about the same number of melanosomes. 
B) The color of the melanosome dictates skin color. 
C) Excess sunlight decreases melanin. 
D) White Europeans lack melanosomes. 
E) All of these are true.

Question 6

Short hair (L) is dominant to long hair (l).If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this indicates that

Accepted Answer

A) the short-haired animal is pure-breeding. 
B) the short-haired animal is not pure-breeding. 
C) the long-haired animal is not pure-breeding. 
D) the long-haired animal is pure-breeding. 
E) none of these can be determined with two offspring. 
A) the short-haired animal is pure-breeding. 
B) the short-haired animal is not pure-breeding. 
C) the long-haired animal is not pure-breeding. 
D) the long-haired animal is pure-breeding. 
E) none of these can be determined with two offspring.

Question 7

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).A cross of Bb Ss with bb ss will produce the phenotypic ratio

Accepted Answer

A) 9:3:3:1. 
B) 1:1:1:1. 
C) 1:2:1. 
D) 3:1. 
E) of none of these. 
A) 9:3:3:1. 
B) 1:1:1:1. 
C) 1:2:1. 
D) 3:1. 
E) of none of these.

Question 8

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).If two dihybrids (Bb Ss) are crossed, which will be produced?

Accepted Answer

A) black and spotted pure-breeding forms 
B) black and solid pure-breeding forms 
C) red and solid pure-breeding forms 
D) red and spotted pure-breeding forms 
E) all of these 
A) black and spotted pure-breeding forms 
B) black and solid pure-breeding forms 
C) red and solid pure-breeding forms 
D) red and spotted pure-breeding forms 
E) all of these

Question 9

If two genes are on the same chromosome,

Accepted Answer

A) crossing over occurs frequently. 
B) they assort independently. 
C) they are in the same linkage group. 
D) they are segregated during meiosis. 
E) an inversion will usually occur. 
A) crossing over occurs frequently. 
B) they assort independently. 
C) they are in the same linkage group. 
D) they are segregated during meiosis. 
E) an inversion will usually occur.

Question 10

Which of the following statements about the F2 generation produced in the dihybrid cross is NOT true?

Accepted Answer

A) All offspring with the same phenotype have the same genotype. 
B) All offspring with the same genotype possess the same phenotype. 
C) It is not possible to determine the genotype of some individuals by their phenotype. 
D) It is possible to tell the genotype of some offspring by looking at their phenotypes. 
E) Nine genotypes and four phenotypes are produced. 
A) All offspring with the same phenotype have the same genotype. 
B) All offspring with the same genotype possess the same phenotype. 
C) It is not possible to determine the genotype of some individuals by their phenotype. 
D) It is possible to tell the genotype of some offspring by looking at their phenotypes. 
E) Nine genotypes and four phenotypes are produced.

Question 11

The pea plant was an excellent choice for Mendel's experiments because

Accepted Answer

A) true-breeding varieties were available. 
B) the plant can self-fertilize. 
C) it can be cross-fertilized. 
D) true-breeding varieties were available, and it can be cross-fertilized. 
E) true-breeding varieties were available, the plant can self-fertilize, and it can be cross-fertilized. 
A) true-breeding varieties were available. 
B) the plant can self-fertilize. 
C) it can be cross-fertilized. 
D) true-breeding varieties were available, and it can be cross-fertilized. 
E) true-breeding varieties were available, the plant can self-fertilize, and it can be cross-fertilized.

Question 12

Blood types (A, B, and O) are controlled by

Accepted Answer

A) sex-linked genes. 
B) linked genes. 
C) incompletely dominant genes. 
D) multiple alleles. 
E) none of these. 
A) sex-linked genes. 
B) linked genes. 
C) incompletely dominant genes. 
D) multiple alleles. 
E) none of these.

Question 13

The F2 phenotypic ratio of a monohybrid cross is

Accepted Answer

A) 1:1. 
B) 2:1. 
C) 9:3:3:1. 
D) 1:2:1. 
E) 3:1. 
A) 1:1. 
B) 2:1. 
C) 9:3:3:1. 
D) 1:2:1. 
E) 3:1.

Question 14

The illustration below shows the F2 phenotypes from a monohybrid cross in snapdragons.What type of inheritance produces such an outcome?

Accepted Answer

A) complete dominance 
B) incomplete dominance 
C) multiple alleles 
D) continuous variation 
E) epistasis 
A) complete dominance 
B) incomplete dominance 
C) multiple alleles 
D) continuous variation 
E) epistasis

Question 15

The theory of independent assortment

Accepted Answer

A) is not demonstrated in a monohybrid cross. 
B) is illustrated by the behavior of linked genes. 
C) indicates that the expression of one gene is independent of the action of another gene. 
D) states that alleles for the same characteristic separate during meiosis. 
E) is negated by the phenomenon of epistasis. 
A) is not demonstrated in a monohybrid cross. 
B) is illustrated by the behavior of linked genes. 
C) indicates that the expression of one gene is independent of the action of another gene. 
D) states that alleles for the same characteristic separate during meiosis. 
E) is negated by the phenomenon of epistasis.

Question 16

The most accurate description of an organism with genotype AaBb is

Accepted Answer

A) homozygous dominant. 
B) heterozygous. 
C) heterozygous dominant. 
D) homozygous recessive. 
E) heterozygous recessive. 
A) homozygous dominant. 
B) heterozygous. 
C) heterozygous dominant. 
D) homozygous recessive. 
E) heterozygous recessive.

Question 17

According to Mendel, what kinds of genes "disappear" in F1 pea plants?

Accepted Answer

A) sex-linked 
B) dominant 
C) recessive 
D) codominant 
E) lethal 
A) sex-linked 
B) dominant 
C) recessive 
D) codominant 
E) lethal

Question 18

If red (RR) is crossed with white (rr) and produces a pink flower (Rr), and tall (D) is dominant to dwarf (d), the F2 phenotypic ratio from a cross of RR dd with rr DD would be

Accepted Answer

A) 9:3:3:1. 
B) 1:1:1:1. 
C) 1:2:2:4:1:2:1:2:1. 
D) 3:6:3:1:2:1. 
E) none of these. 
A) 9:3:3:1. 
B) 1:1:1:1. 
C) 1:2:2:4:1:2:1:2:1. 
D) 3:6:3:1:2:1. 
E) none of these.

Question 19

The ABO blood types are controlled by

Accepted Answer

A) pleiotropy. 
B) multiple alleles. 
C) incomplete dominance. 
D) codominance. 
E) multiple alleles and codominance. 
A) pleiotropy. 
B) multiple alleles. 
C) incomplete dominance. 
D) codominance. 
E) multiple alleles and codominance.

Question 20

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).If a red male is crossed with a black female to produce a red, spotted puppy, the genotypes of the parents (with male genotype first) will be

Accepted Answer

A) Bb Ss x Bb Ss. 
B) bb Ss x Bb Ss. 
C) bb ss x Bb Ss. 
D) bb Ss x Bb ss. 
E) Bb ss x Bb ss 
A) Bb Ss x Bb Ss. 
B) bb Ss x Bb Ss. 
C) bb ss x Bb Ss. 
D) bb Ss x Bb ss. 
E) Bb ss x Bb ss

Exam 11: Observing Patterns in Inherited Traits

If shape and color of radishes are due to incompletely dominant genes, crossing two dihybrid heterozygotes will produce how many different phenotypes?

Which of the following statements is true?

If all offspring of a cross have the genotype Aa, the parents of the cross are most likely

If one pair of alleles exhibits simple dominance while the other pair exhibits incomplete dominance, the F2 phenotype produced from a cross of AA BB with aa bb will produce a __________ ratio.

Which of the following is TRUE of melanosomes?

Short hair (L) is dominant to long hair (l).If a short-haired animal of unknown origin is crossed with a long-haired animal and they produce one long-haired and one short-haired offspring, this indicates that

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).A cross of Bb Ss with bb ss will produce the phenotypic ratio

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).If two dihybrids (Bb Ss) are crossed, which will be produced?

If two genes are on the same chromosome,

Which of the following statements about the F2 generation produced in the dihybrid cross is NOT true?

The pea plant was an excellent choice for Mendel's experiments because

Blood types (A, B, and O) are controlled by

The F2 phenotypic ratio of a monohybrid cross is

The illustration below shows the F2 phenotypes from a monohybrid cross in snapdragons.What type of inheritance produces such an outcome?

The theory of independent assortment

The most accurate description of an organism with genotype AaBb is

According to Mendel, what kinds of genes "disappear" in F1 pea plants?

If red (RR) is crossed with white (rr) and produces a pink flower (Rr), and tall (D) is dominant to dwarf (d), the F2 phenotypic ratio from a cross of RR dd with rr DD would be

The ABO blood types are controlled by

In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s).If a red male is crossed with a black female to produce a red, spotted puppy, the genotypes of the parents (with male genotype first) will be

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If one pair of alleles exhibits simple dominance while the other pair exhibits incomplete dominance, the F₂ phenotype produced from a cross of AA BB with aa bb will produce a __________ ratio.

Which of the following statements about the F₂ generation produced in the dihybrid cross is NOT true?

The F₂ phenotypic ratio of a monohybrid cross is

The illustration below shows the F₂phenotypes from a monohybrid cross in snapdragons.What type of inheritance produces such an outcome?

According to Mendel, what kinds of genes "disappear" in F₁pea plants?

If red (RR) is crossed with white (rr) and produces a pink flower (Rr), and tall (D) is dominant to dwarf (d), the F₂ phenotypic ratio from a cross of RR dd with rr DD would be