Question 1

Mendel's dihybrid crosses, but not his monohybrid crosses, show that

Accepted Answer

A) some genes are linked together. 
B) the two alleles controlling a trait are divided equally among the gametes. 
C) alleles for different traits are inherited independently. 
D) one of the pair of alleles is dominant to the other. 
E) the crossing of two different homozygous forms will not produce any offspring in the first generation that will look like either of the parents. 
A) some genes are linked together. 
B) the two alleles controlling a trait are divided equally among the gametes. 
C) alleles for different traits are inherited independently. 
D) one of the pair of alleles is dominant to the other. 
E) the crossing of two different homozygous forms will not produce any offspring in the first generation that will look like either of the parents.

Question 2

Which of the following is NOT a characteristic of the plants with which Mendel worked?

Accepted Answer

A) They produce male and female parts. 
B) They exhibit blending inheritance. 
C) They normally self-fertilize. 
D) They have many different contrasting traits and exhibit some pure-breeding varieties. 
E) They can easily be cross-fertilized by human manipulation. 
A) They produce male and female parts. 
B) They exhibit blending inheritance. 
C) They normally self-fertilize. 
D) They have many different contrasting traits and exhibit some pure-breeding varieties. 
E) They can easily be cross-fertilized by human manipulation.

Question 3

From the relative positions of genes on the chromosome illustration below, we expect

Accepted Answer

A) the highest frequency of crossing over between genes A and D. 
B) more crossing over between C and D than between A and B. 
C) more crossing over between A and B than between B and C. 
D) the lowest frequency of crossing over between B and C. 
E) none of these. 
A) the highest frequency of crossing over between genes A and D. 
B) more crossing over between C and D than between A and B. 
C) more crossing over between A and B than between B and C. 
D) the lowest frequency of crossing over between B and C. 
E) none of these.

Question 4

A homozygous dominant parent will produce

Accepted Answer

A) one type of gamete with this one homozygous allele. 
B) two types of gamete with this one homozygous allele. 
C) a mixture of gametes with both homozygous and recessive alleles. 
D) a single gamete with a single mutant allele. 
E) none of these. 
A) one type of gamete with this one homozygous allele. 
B) two types of gamete with this one homozygous allele. 
C) a mixture of gametes with both homozygous and recessive alleles. 
D) a single gamete with a single mutant allele. 
E) none of these.

Question 5

Mendel's study of genetics differed from studies of his contemporaries' because he

Accepted Answer

A) used only pure-breeding parents. 
B) examined several different traits at the same time. 
C) kept careful records and analyzed the data statistically. 
D) worked on plants rather than animals. 
E) confirmed the blending theory of inheritance. 
A) used only pure-breeding parents. 
B) examined several different traits at the same time. 
C) kept careful records and analyzed the data statistically. 
D) worked on plants rather than animals. 
E) confirmed the blending theory of inheritance.

Question 6

If short hair (L) is dominant to long hair (l), animals LL and Ll have the same

Accepted Answer

A) parents. 
B) genotypes. 
C) phenotypes. 
D) alleles. 
E) genes. 
A) parents. 
B) genotypes. 
C) phenotypes. 
D) alleles. 
E) genes.

Question 7

A graph of phenotypic variation similar to the illustration below strongly suggests

Accepted Answer

A) incomplete dominance. 
B) codominance. 
C) epistasis. 
D) polygenic inheritance. 
E) environmental effects on phenotype. 
A) incomplete dominance. 
B) codominance. 
C) epistasis. 
D) polygenic inheritance. 
E) environmental effects on phenotype.

Question 8

A testcross consists of a cross

Accepted Answer

A) of two pure-breeding forms to find out which form of a gene is dominant. 
B) between two unknown forms to determine their genotypes. 
C) between an offspring and its homozygous dominant parent. 
D) of an organism of dominant phenotype but unknown genotype to an individual that is homozygous recessive for that trait. 
E) of two F2 individuals to produce an F3 generation. 
A) of two pure-breeding forms to find out which form of a gene is dominant. 
B) between two unknown forms to determine their genotypes. 
C) between an offspring and its homozygous dominant parent. 
D) of an organism of dominant phenotype but unknown genotype to an individual that is homozygous recessive for that trait. 
E) of two F2 individuals to produce an F3 generation.

Question 9

If all the offspring of a cross have the genotype Aa Bb, the parents of the cross will most likely be

Accepted Answer

A) AA BB x aa bb. 
B) AA bb x aa BB. 
C) Aa Bb x Aa Bb. 
D) Aa bb x aa Bb. 
E) AA BB x aa bb or AA bb x aa BB. 
A) AA BB x aa bb. 
B) AA bb x aa BB. 
C) Aa Bb x Aa Bb. 
D) Aa bb x aa Bb. 
E) AA BB x aa bb or AA bb x aa BB.

Question 10

If the paternal chromosome has alleles L, M, and n and the maternal chromosomes have l, m, and N, then the chromosome that cannot be produced by crossing over is

Accepted Answer

A) LMN 
B) LMn 
C) LmN 
D) Lmn 
E) lmn 
A) LMN 
B) LMn 
C) LmN 
D) Lmn 
E) lmn

Question 11

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

Accepted Answer

A) be homozygous. 
B) display the same phenotype as the RR parent. 
C) display the same phenotype as the rr parent. 
D) have the same genotype as the RR parent. 
E) have the same genotype as the rr parent. 
A) be homozygous. 
B) display the same phenotype as the RR parent. 
C) display the same phenotype as the rr parent. 
D) have the same genotype as the RR parent. 
E) have the same genotype as the rr parent.

Question 12

In incomplete dominance,

Accepted Answer

A) one allele is not dominant to another allele. 
B) the genotype can be determined by the phenotype. 
C) the heterozygote is somewhat intermediate to the two homozygotes. 
D) the intermediate phenotype may be the result of enzyme insufficiency. 
E) all of these are true. 
A) one allele is not dominant to another allele. 
B) the genotype can be determined by the phenotype. 
C) the heterozygote is somewhat intermediate to the two homozygotes. 
D) the intermediate phenotype may be the result of enzyme insufficiency. 
E) all of these are true.

Question 13

Genes that are located on the same chromosome

Accepted Answer

A) tend to be inherited together. 
B) will usually appear together in the gamete. 
C) are said to be linked. 
D) may be separated during crossing over. 
E) are all of these. 
A) tend to be inherited together. 
B) will usually appear together in the gamete. 
C) are said to be linked. 
D) may be separated during crossing over. 
E) are all of these.

Question 14

If one parent has type A blood and the other parent has type B, then which of the following is possible in the children?

Accepted Answer

A) only AB 
B) A and AB 
C) B and AB 
D) A, B, AB, and O 
E) only O 
A) only AB 
B) A and AB 
C) B and AB 
D) A, B, AB, and O 
E) only O

Question 15

The difference between people who handle stress well and those who become deeply depressed is based on all BUT

Accepted Answer

A) polygenic inheritance. 
B) genes and the environment. 
C) a transporter protein that moves serotonin into brain cells. 
D) a gene product that counters anxiety. 
E) a gene mutation. 
A) polygenic inheritance. 
B) genes and the environment. 
C) a transporter protein that moves serotonin into brain cells. 
D) a gene product that counters anxiety. 
E) a gene mutation.

Question 16

In __________, a pair of nonidentical alleles affecting two phenotypes for a given trait is both expressed at the same time in heterozygotes.

Accepted Answer

A) pleiotropy 
B) polygenic inheritance 
C) complete dominance 
D) codominance 
E) a multiple allele system 
A) pleiotropy 
B) polygenic inheritance 
C) complete dominance 
D) codominance 
E) a multiple allele system

Question 17

Genes at one locus that affect the expression of genes at a different locus are said to be

Accepted Answer

A) epistatic. 
B) linked. 
C) codominant. 
D) penetrant. 
E) alleles. 
A) epistatic. 
B) linked. 
C) codominant. 
D) penetrant. 
E) alleles.

Question 18

If a woman of blood type A has a child of blood type O, the father may belong to

Accepted Answer

A) blood type A, AB, or O, but not B. 
B) blood type O only. 
C) blood type A or B only. 
D) blood type A, B, or O, but not AB. 
E) any blood type other than A. 
A) blood type A, AB, or O, but not B. 
B) blood type O only. 
C) blood type A or B only. 
D) blood type A, B, or O, but not AB. 
E) any blood type other than A.

Question 19

For Mendel's explanation of inheritance to be correct,

Accepted Answer

A) the genes for the traits he studied have to be located on the same chromosome. 
B) the combination of gametes at fertilization has to be due to chance. 
C) genes cannot be transmitted independently of each other. 
D) only diploid organisms demonstrate inheritance patterns. 
E) none of these apply. 
A) the genes for the traits he studied have to be located on the same chromosome. 
B) the combination of gametes at fertilization has to be due to chance. 
C) genes cannot be transmitted independently of each other. 
D) only diploid organisms demonstrate inheritance patterns. 
E) none of these apply.

Question 20

All BUT which of these genotypes is a possible F1 gamete for a dihybrid cross between AA BB with aa bb?

Accepted Answer

A) Aa 
B) Ab 
C) AB 
D) aB 
E) ab 
A) Aa 
B) Ab 
C) AB 
D) aB 
E) ab

Exam 11: Observing Patterns in Inherited Traits

Mendel's dihybrid crosses, but not his monohybrid crosses, show that

Which of the following is NOT a characteristic of the plants with which Mendel worked?

From the relative positions of genes on the chromosome illustration below, we expect

A homozygous dominant parent will produce

Mendel's study of genetics differed from studies of his contemporaries' because he

If short hair (L) is dominant to long hair (l), animals LL and Ll have the same

A graph of phenotypic variation similar to the illustration below strongly suggests

A testcross consists of a cross

If all the offspring of a cross have the genotype Aa Bb, the parents of the cross will most likely be

If the paternal chromosome has alleles L, M, and n and the maternal chromosomes have l, m, and N, then the chromosome that cannot be produced by crossing over is

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

In incomplete dominance,

Genes that are located on the same chromosome

If one parent has type A blood and the other parent has type B, then which of the following is possible in the children?

The difference between people who handle stress well and those who become deeply depressed is based on all BUT

In __________, a pair of nonidentical alleles affecting two phenotypes for a given trait is both expressed at the same time in heterozygotes.

Genes at one locus that affect the expression of genes at a different locus are said to be

If a woman of blood type A has a child of blood type O, the father may belong to

For Mendel's explanation of inheritance to be correct,

All BUT which of these genotypes is a possible F1 gamete for a dihybrid cross between AA BB with aa bb?

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

A Closer Look at Cell Membranes

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters

All BUT which of these genotypes is a possible F₁gamete for a dihybrid cross between AA BB with aa bb?