BIOL 1201 EXAMS: LATEST A+ GUIDE WITH ESSENTIAL
QUESTIONS AND ANSWERS
All the offspring of a cross between a red-flowered plant and a white-flowered plant have
pink flowers. This means that the allele for red flowers is ______ to the allele for white
flowers.
a) Codominant
b) Plieotropic
c) Incompletely Dominant
d) Recessive
e) Dominant
c) Incompletely Dominant
A cross between homozygous purple-flowered and homozygous white-flowered pea plants
results in offspring with purple flowers. This demonstrates:
a) the mistakes made by Mendel
b) dominance
c) true-breeding
d) a dyhybrid cross
e) the blending model of genetics
b) dominance
All the offspring of a cross between a black-eyed MendAlien and an orange-eyed MendAlien
have black eyes. This means that the allele for black eyes is ______ the allele for orange eyes.
a) dominant to
b) more aggressive than
c) better than
d) codominant to
e) recessive to
a) dominant to
Which of the following is true for alleles?
a) They can be identical or different for any given gene in a somatic cell.
b) They can be dominant or recessive.
c) They can be identical or different for any given gene in a somatic cell. They can be
dominant or recessive.
d) They can be identical or different for any given gene in a somatic cell. They can be
dominant or recessive. They can represent alternative forms of a gene.
e) They can represent alternative forms of a gene.
, d) They can be identical or different for any given gene in a somatic cell. They can be dominant
or recessive. They can represent alternative forms of a gene.
What is the expected phenotypic ratio of a cross between two orange-eyed MendAliens?
a) 1 black-eyed; 1 orange-eyed
b) 3 black-eyed; 1 orange-eyed
c) 0 black-eyed; 1 orange-eyed
d) 1 black-eyed; 0 orange-eyed
e) 1 black-eyed; 3 orange-eyed
c) 0 black-eyed; 1 orange-eyed
In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring
of red (RR) and white (rr) homozygotes. Which of the following crosses would produce
offspring in the ratio of 1 red:2 roan:1 white?
a) white x roan
b) red × white
c) roan × roan
d) The answer cannot be determined from the information provided.
e) red × roan
c) roan x roan
Pea plants were particularly well suited for use in Mendel's breeding experiments for all of
the following reasons EXCEPT that:
a) peas show easily observed variations in a number of characters, such as pea shape and
flower color.
b) many of the observable characters that vary in pea plants are controlled by single genes.
c) it is possible to completely control matings between different pea plants.
d) it is possible to obtain large numbers of progeny from any given cross.
e) peas have an unusually long generation time.
e) peas have an unusually long generation time.
A human somatic cell contains_______.
a) 22 autosomes and 1 sex chromosome.
b) 44 autosomes and 2 sex chromosomes.
c) n chromosomes.
d) 21 autosomes and 2 sex chromosomes.
e) 45 autosomes and 1 sex chromosome.
b) 44 autosomes and 2 sex chromosomes.
Mitosis results in the formation of ________; Meiosis results in the formation of ________.
a) four haploid cells...two diploid cells
QUESTIONS AND ANSWERS
All the offspring of a cross between a red-flowered plant and a white-flowered plant have
pink flowers. This means that the allele for red flowers is ______ to the allele for white
flowers.
a) Codominant
b) Plieotropic
c) Incompletely Dominant
d) Recessive
e) Dominant
c) Incompletely Dominant
A cross between homozygous purple-flowered and homozygous white-flowered pea plants
results in offspring with purple flowers. This demonstrates:
a) the mistakes made by Mendel
b) dominance
c) true-breeding
d) a dyhybrid cross
e) the blending model of genetics
b) dominance
All the offspring of a cross between a black-eyed MendAlien and an orange-eyed MendAlien
have black eyes. This means that the allele for black eyes is ______ the allele for orange eyes.
a) dominant to
b) more aggressive than
c) better than
d) codominant to
e) recessive to
a) dominant to
Which of the following is true for alleles?
a) They can be identical or different for any given gene in a somatic cell.
b) They can be dominant or recessive.
c) They can be identical or different for any given gene in a somatic cell. They can be
dominant or recessive.
d) They can be identical or different for any given gene in a somatic cell. They can be
dominant or recessive. They can represent alternative forms of a gene.
e) They can represent alternative forms of a gene.
, d) They can be identical or different for any given gene in a somatic cell. They can be dominant
or recessive. They can represent alternative forms of a gene.
What is the expected phenotypic ratio of a cross between two orange-eyed MendAliens?
a) 1 black-eyed; 1 orange-eyed
b) 3 black-eyed; 1 orange-eyed
c) 0 black-eyed; 1 orange-eyed
d) 1 black-eyed; 0 orange-eyed
e) 1 black-eyed; 3 orange-eyed
c) 0 black-eyed; 1 orange-eyed
In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring
of red (RR) and white (rr) homozygotes. Which of the following crosses would produce
offspring in the ratio of 1 red:2 roan:1 white?
a) white x roan
b) red × white
c) roan × roan
d) The answer cannot be determined from the information provided.
e) red × roan
c) roan x roan
Pea plants were particularly well suited for use in Mendel's breeding experiments for all of
the following reasons EXCEPT that:
a) peas show easily observed variations in a number of characters, such as pea shape and
flower color.
b) many of the observable characters that vary in pea plants are controlled by single genes.
c) it is possible to completely control matings between different pea plants.
d) it is possible to obtain large numbers of progeny from any given cross.
e) peas have an unusually long generation time.
e) peas have an unusually long generation time.
A human somatic cell contains_______.
a) 22 autosomes and 1 sex chromosome.
b) 44 autosomes and 2 sex chromosomes.
c) n chromosomes.
d) 21 autosomes and 2 sex chromosomes.
e) 45 autosomes and 1 sex chromosome.
b) 44 autosomes and 2 sex chromosomes.
Mitosis results in the formation of ________; Meiosis results in the formation of ________.
a) four haploid cells...two diploid cells
