BIO 340 EXAM QUESTIONS AND ANSWERS 100%
CORRECT LATEST UPDATE
Why do your chromosomes come in pairs?
a. Because DNA is double-stranded, one member of each chromosome pair carries a
strand that is complementary to the strand carried by the other chromosome.
b. Because cell division via mitosis cannot take place without paired chromosomes.
c. Because one member of each pair came from my mother and the other from my
father.
d. Because so many genes of genetic information must be carried, all organisms,
including humans, must possess an amount of DNA that is doubled to fit it all inside. -
ANSWER c. Because one member of each pair came from my mother and the other from
my father.
How did Mendel cross-fertilize the peas?
a. He placed them close together in the garden
b. He kept them apart and pollinated them by hand.
c. He allowed them to self-fertilize.
d. He did nothing at all. - ANSWER b. He kept them apart and pollinated them by hand.
The observable traits expressed by an organism are described as its ________.
a. phenotype
b. genotype
c. alleles
d. zygote - ANSWER a. phenotype
d Which of the following is correct? Half of the gametes produced by an organism with
the genotype Aa will receive the A allele, while half will receive the a allele. An example
,of ______.
a. independent assortment
b. mutation
c. random fertilization
d. segregation -ANSWER d. segregation
Which of the following statements concerning genes on different chromosomes is
CORRECT?
a. The genes are inherited independently of one another.
b. Only the dominant alleles of these genes tend to be inherited together.
c. These genes are always inherited together.
d. These genes are more likely to undergo mutation.
e. I don't know the answer. - ANSWER a. These genes are inherited independently of
each other.
A recessive trait will be observed in individuals that are ________ for that trait.
a. heterozygous
b. homozygous or heterozygous
c. homozygous
d. diploid - ANSWER c. homozygous
What kind of gametes could the genotype AaBb possibly produce?
a. Aa, Bb
b. AA, aa, BB, bb
c. AB, Ab, aB, ab
d. AB, ab - ANS c. AB, Ab, aB, ab
How many kinds of gametes could an organism having the genotype AABbCc make?
,a. 3
b. 4
c. 5
d. 6
e. 8 - ANS b. 4
Work out the genetic problems for questions about a plant species in which orange
flower colour is dominant to white and round leaf shape is dominant to oval. A
true-breeding orange-flowering, round-leaved male plant, plant A, is crossed to a
true-breeding white-flowering oval-leaved female plant, plant B, to produce a dihybrid
offspring plant, plant C. Questions Assuming Mendelian genetics and independent
inheritance of the two traits, what gametes might be produced by Plant C? a. OoSs b. OS
c. oS d. Both OS and oS e. Both OoSs and OS - ANSWER d. Both OS and oS
Coat color in guinea pigs is determined by one gene with two alleles. A guinea pig from a
true-breeding black strain is crossed to a guinea pig from a true-breeding white strain.
The F1 offspring are all black. Two of the F1 offspring are crossed to each other. What is
the expected proportion of white in the F2 offspring?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER c. 1/4
Coat color in guinea pigs is determined by a single gene with two alleles. A guinea pig
from a true-breeding black strain is crossed to a guinea pig from a true-breeding white
strain. All the F1 offspring are black. Two of the F1 offspring are crossed to one another.
What is the expected proportion of black F2 offspring that are homozygous?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER b. 1/3
, Presence of short hairs on leaves is controlled by dominant allele H. Plants having
genotype hh have smooth leaves. Two parential plants of unknown genotype were
crossed. What are the parental genotypes if F1= 32 Hairy and 11 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH ANSWER c. Hh x Hh
The presence of short hairs on leaves is controlled by dominant allele H. Plants with
genotype hh have smooth leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 0 Hairy and 24 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH - ANSWER d. hh x hh
Mendel proposed that a pea pod color was determined by a gene with two alleles and
the allele for yellow seeds (Y) is dominant to the allele for green seeds (y). What would
Mendel predict the seed color to be from a cross of a male plant with the heterozygous
Yy genotype with a female plant that has the genotype yy? a. the seeds would all be
green.
b. All seeds must be yellow. c. For every yellow seed, there needs to be 3 green seeds.
d. For every 3 yellow seeds, there needs to be 1 green seed. e. For every yellow seed,
there needs to be 1 green seed. - ANSWER e. For each yellow seed, there must be 1
green seed.
In apples, the allele A is dominant for a big size apple and the allele R is dominant for red
color. You cross one tree that produces big yellow apples and another tree that
produces small red apples. Half of the offspring trees produce big red apples and half
produce big yellow apples. What are the genotypes of parents?
a. AArr and aaRr
CORRECT LATEST UPDATE
Why do your chromosomes come in pairs?
a. Because DNA is double-stranded, one member of each chromosome pair carries a
strand that is complementary to the strand carried by the other chromosome.
b. Because cell division via mitosis cannot take place without paired chromosomes.
c. Because one member of each pair came from my mother and the other from my
father.
d. Because so many genes of genetic information must be carried, all organisms,
including humans, must possess an amount of DNA that is doubled to fit it all inside. -
ANSWER c. Because one member of each pair came from my mother and the other from
my father.
How did Mendel cross-fertilize the peas?
a. He placed them close together in the garden
b. He kept them apart and pollinated them by hand.
c. He allowed them to self-fertilize.
d. He did nothing at all. - ANSWER b. He kept them apart and pollinated them by hand.
The observable traits expressed by an organism are described as its ________.
a. phenotype
b. genotype
c. alleles
d. zygote - ANSWER a. phenotype
d Which of the following is correct? Half of the gametes produced by an organism with
the genotype Aa will receive the A allele, while half will receive the a allele. An example
,of ______.
a. independent assortment
b. mutation
c. random fertilization
d. segregation -ANSWER d. segregation
Which of the following statements concerning genes on different chromosomes is
CORRECT?
a. The genes are inherited independently of one another.
b. Only the dominant alleles of these genes tend to be inherited together.
c. These genes are always inherited together.
d. These genes are more likely to undergo mutation.
e. I don't know the answer. - ANSWER a. These genes are inherited independently of
each other.
A recessive trait will be observed in individuals that are ________ for that trait.
a. heterozygous
b. homozygous or heterozygous
c. homozygous
d. diploid - ANSWER c. homozygous
What kind of gametes could the genotype AaBb possibly produce?
a. Aa, Bb
b. AA, aa, BB, bb
c. AB, Ab, aB, ab
d. AB, ab - ANS c. AB, Ab, aB, ab
How many kinds of gametes could an organism having the genotype AABbCc make?
,a. 3
b. 4
c. 5
d. 6
e. 8 - ANS b. 4
Work out the genetic problems for questions about a plant species in which orange
flower colour is dominant to white and round leaf shape is dominant to oval. A
true-breeding orange-flowering, round-leaved male plant, plant A, is crossed to a
true-breeding white-flowering oval-leaved female plant, plant B, to produce a dihybrid
offspring plant, plant C. Questions Assuming Mendelian genetics and independent
inheritance of the two traits, what gametes might be produced by Plant C? a. OoSs b. OS
c. oS d. Both OS and oS e. Both OoSs and OS - ANSWER d. Both OS and oS
Coat color in guinea pigs is determined by one gene with two alleles. A guinea pig from a
true-breeding black strain is crossed to a guinea pig from a true-breeding white strain.
The F1 offspring are all black. Two of the F1 offspring are crossed to each other. What is
the expected proportion of white in the F2 offspring?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER c. 1/4
Coat color in guinea pigs is determined by a single gene with two alleles. A guinea pig
from a true-breeding black strain is crossed to a guinea pig from a true-breeding white
strain. All the F1 offspring are black. Two of the F1 offspring are crossed to one another.
What is the expected proportion of black F2 offspring that are homozygous?
a. 1/2
b. 1/3
c. 1/4
d. 3/4 - ANSWER b. 1/3
, Presence of short hairs on leaves is controlled by dominant allele H. Plants having
genotype hh have smooth leaves. Two parential plants of unknown genotype were
crossed. What are the parental genotypes if F1= 32 Hairy and 11 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH ANSWER c. Hh x Hh
The presence of short hairs on leaves is controlled by dominant allele H. Plants with
genotype hh have smooth leaves. Two parental plants with unknown genotype were
crossed. What are the parental genotypes if F1= 0 Hairy and 24 smooth?
a. HH x hh
b. Hh x hh
c. Hh x Hh
d. hh x hh
e. HH x HH - ANSWER d. hh x hh
Mendel proposed that a pea pod color was determined by a gene with two alleles and
the allele for yellow seeds (Y) is dominant to the allele for green seeds (y). What would
Mendel predict the seed color to be from a cross of a male plant with the heterozygous
Yy genotype with a female plant that has the genotype yy? a. the seeds would all be
green.
b. All seeds must be yellow. c. For every yellow seed, there needs to be 3 green seeds.
d. For every 3 yellow seeds, there needs to be 1 green seed. e. For every yellow seed,
there needs to be 1 green seed. - ANSWER e. For each yellow seed, there must be 1
green seed.
In apples, the allele A is dominant for a big size apple and the allele R is dominant for red
color. You cross one tree that produces big yellow apples and another tree that
produces small red apples. Half of the offspring trees produce big red apples and half
produce big yellow apples. What are the genotypes of parents?
a. AArr and aaRr
