Bio bank
Biology 103 Test 4 Chapters 9,10,11,12
Multiple Choice
1) A monohybrid cross is
A) the second generation of a self-fertilized plant.
B) a breeding experiment in which the parental varieties have only one trait in common.
C) a breeding experiment in which the parental varieties differ in only one character.
D) a triploid plant that results from breeding two very different plants.
E) a breeding experiment in which the parental varieties have only one prominent trait.
2) Which of the following statements regarding genotypes and phenotypes is false?
A) The genetic makeup of an organism constitutes its genotype.
B) An organism with two different alleles for a single trait is said to be heterozygous for that trait.
C) Alleles are alternate forms of a gene.
D) An allele that is fully expressed is referred to as recessive.
E) The expressed physical traits of an organism are called its phenotype.
3) Which of the following most accurately restates Mendel’s law of segregation
A) genes are inherited in discrete units from one generation to the next
B) genes can exist in different forms, known as alleles
C) homologous chromosomes separate during gamete formation
D) genes on different chromosomes are inherited independently
E) all of the above
4) The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be
A) 1:2:1.
B) 3:1.
C) 9:1:1:3.
D) 3:9:9:1.
E) 9:3:3:1.
5) Mendel's law of independent assortment states that
A) chromosomes sort independently of each other during mitosis and meiosis.
B) genes sort independently of each other in animals but not in plants.
C) independent sorting of genes produces polyploid plants under some circumstances.
D) each pair of alleles segregates independently of the other pairs of alleles during gamete formation.
E) genes are sorted concurrently during gamete formation.
6) A testcross is
A) a mating between an individual of unknown genotype
Multiple Choice
1) A monohybrid cross is
A) the second generation of a self-fertilized plant.
B) a breeding experiment in which the parental varieties have only one trait in common.
C) a breeding experiment in which the parental varieties differ in only one character.
D) a triploid plant that results from breeding two very different plants.
E) a breeding experiment in which the parental varieties have only one prominent trait.
2) Which of the following statements regarding genotypes and phenotypes is false?
A) The genetic makeup of an organism constitutes its genotype.
B) An organism with two different alleles for a single trait is said to be heterozygous for that trait.
C) Alleles are alternate forms of a gene.
D) An allele that is fully expressed is referred to as recessive.
E) The expressed physical traits of an organism are called its phenotype.
3) Which of the following most accurately restates Mendel’s law of segregation
A) genes are inherited in discrete units from one generation to the next
B) genes can exist in different forms, known as alleles
C) homologous chromosomes separate during gamete formation
D) genes on different chromosomes are inherited independently
E) all of the above
4) The phenotypic ratio resulting from a dihybrid cross showing independent assortment is expected to be
A) 1:2:1.
B) 3:1.
C) 9:1:1:3.
D) 3:9:9:1.
E) 9:3:3:1.
5) Mendel's law of independent assortment states that
A) chromosomes sort independently of each other during mitosis and meiosis.
B) genes sort independently of each other in animals but not in plants.
C) independent sorting of genes produces polyploid plants under some circumstances.
D) each pair of alleles segregates independently of the other pairs of alleles during gamete formation.
E) genes are sorted concurrently during gamete formation.
6) A testcross is
A) a mating between an individual of unknown genotype