Bio 112 Exam - Questions With Fully Explained
Solutions
True/ False. Darwin proposed natural selection as the mechanism for the
evolutionary adaptation of populations to their environment. Right Ans -
True
True/False. An atom with a net (overall) negative charge must have more
protons than electrons. Right Ans - false
The water property that refers to water molecules being able to stick to other
polar molecules by hydrogen bonds is called _______. This property enables
water to climb upwards through plant water vessels and thin glass tubes via
_____ action. Right Ans - adhesion, capillary
This level of protein structure features alpha helices and beta-pleated sheets
and is primarily due to hydrogen bonding; ________ Right Ans - 2ndary
structure
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular
trait. What does this suggest?
that a blending of traits has occurred
that the trait shows incomplete dominance
that the parents were true-breeding for contrasting traits
that the parents were both heterozygous for a single trait Right Ans - that
the parents were both heterozygous for a single trait
What do we mean when we use the term monohybrid cross?
A monohybrid cross is performed for one generation.
A monohybrid cross results in a 9:3:3:1 phenotypic ratio in the F2 offspring.
A monohybrid cross produces a single offspring.
A monohybrid cross involves a single parent.
A monohybrid cross involves organisms that are heterozygous for one
particular trait. Right Ans - A monohybrid cross involves organisms that
are heterozygous for one particular trait.
, When crossing an organism that is homozygous recessive for a single trait
with a heterozygote, what is the chance of producing an offspring with the
homozygous recessive phenotype?
0%
25%
50%
75% Right Ans - 50%
Mendel's observation of the segregation of alleles in gamete formation has its
basis in which of the following phases of cell division?
prophase I of meiosis
metaphase I of meiosis
anaphase II of meiosis
anaphase I of meiosis Right Ans - anaphase 1 of meiosis
Which of the following statements provides an example of epistasis?
In cacti, there are several genes for the type of spines.
In Drosophila (fruit flies), white eyes can be due to a combination of multiple
genes.
In rabbits and many other mammals, one genotype (ee) prevents any fur color
from developing.
Recessive genotypes for each of two genes (aabb) result in an albino corn
snake. Right Ans - In rabbits and many other mammals, one genotype (ee)
prevents any fur color from developing.
Radish flowers may be red, purple, or white. A cross between a red-flowered
plant and a white flowered plant yields all-purple offspring. The part of the
radish we eat may be oval or long, with long being the dominant trait. If true-
breeding red long radishes are crossed with true-breeding white oval
radishes, the F1 will be expected to be which of the following?
white and long
red and oval
purple and oval
purple and long
red and long Right Ans - purple and long
Marfan syndrome in humans is caused by an abnormality of the connective
tissue protein fibrillin. Patients are usually very tall and thin, with long spindly
fingers, curvature of the spine, sometimes weakened arterial walls, and
Solutions
True/ False. Darwin proposed natural selection as the mechanism for the
evolutionary adaptation of populations to their environment. Right Ans -
True
True/False. An atom with a net (overall) negative charge must have more
protons than electrons. Right Ans - false
The water property that refers to water molecules being able to stick to other
polar molecules by hydrogen bonds is called _______. This property enables
water to climb upwards through plant water vessels and thin glass tubes via
_____ action. Right Ans - adhesion, capillary
This level of protein structure features alpha helices and beta-pleated sheets
and is primarily due to hydrogen bonding; ________ Right Ans - 2ndary
structure
Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular
trait. What does this suggest?
that a blending of traits has occurred
that the trait shows incomplete dominance
that the parents were true-breeding for contrasting traits
that the parents were both heterozygous for a single trait Right Ans - that
the parents were both heterozygous for a single trait
What do we mean when we use the term monohybrid cross?
A monohybrid cross is performed for one generation.
A monohybrid cross results in a 9:3:3:1 phenotypic ratio in the F2 offspring.
A monohybrid cross produces a single offspring.
A monohybrid cross involves a single parent.
A monohybrid cross involves organisms that are heterozygous for one
particular trait. Right Ans - A monohybrid cross involves organisms that
are heterozygous for one particular trait.
, When crossing an organism that is homozygous recessive for a single trait
with a heterozygote, what is the chance of producing an offspring with the
homozygous recessive phenotype?
0%
25%
50%
75% Right Ans - 50%
Mendel's observation of the segregation of alleles in gamete formation has its
basis in which of the following phases of cell division?
prophase I of meiosis
metaphase I of meiosis
anaphase II of meiosis
anaphase I of meiosis Right Ans - anaphase 1 of meiosis
Which of the following statements provides an example of epistasis?
In cacti, there are several genes for the type of spines.
In Drosophila (fruit flies), white eyes can be due to a combination of multiple
genes.
In rabbits and many other mammals, one genotype (ee) prevents any fur color
from developing.
Recessive genotypes for each of two genes (aabb) result in an albino corn
snake. Right Ans - In rabbits and many other mammals, one genotype (ee)
prevents any fur color from developing.
Radish flowers may be red, purple, or white. A cross between a red-flowered
plant and a white flowered plant yields all-purple offspring. The part of the
radish we eat may be oval or long, with long being the dominant trait. If true-
breeding red long radishes are crossed with true-breeding white oval
radishes, the F1 will be expected to be which of the following?
white and long
red and oval
purple and oval
purple and long
red and long Right Ans - purple and long
Marfan syndrome in humans is caused by an abnormality of the connective
tissue protein fibrillin. Patients are usually very tall and thin, with long spindly
fingers, curvature of the spine, sometimes weakened arterial walls, and
