Unit Test — Unit test Answers

0 verified answers
1
Free Preview

Which statements describe gene therapy? Check all that apply. It cures all cases of cystic fibrosis.It involves the modification of DNA.It is easy to apply to all cells affected by the disorder.It attempts to replace a mutated gene with normal DNA.It does not always cure patients who use it.

A
It cures all cases of cystic fibrosis.
B
It involves the modification of DNA.
C
It is easy to apply to all cells affected by the disorder.
D
It attempts to replace a mutated gene with normal DNA.
E
It does not always cure patients who use it.
2
Free Preview

In humans, unattached earlobes are dominant over attached earlobes.

A
Ee
B
e
C
ee
D
E
3

Which nitrogen base sequence is the partner of T-C-A-G-C-A?

A
A-C-G-A-C-T
B
C-A-G-A-T-G
C
A-G-T-C-G-T
D
T-C-A-G-C-A
4

Clarence made a diagram to compare codominance and incomplete dominance.

Question illustration
A
Neither allele is dominant.
B
An intermediate phenotype is expressed in offspring.
C
One allele is dominant over the other.
D
Both dominant alleles are fully expressed in offspring.
5

Which structure carries instructions for producing the proteins that help make a person’s hair curly?

A
phosphate
B
deoxyribose
C
lipid
D
gene
6

Which best describes the offspring of a solid-colored cow (CC) with a spotted cow (SS), assuming the alleles are codominant?

A
All the offspring will have stripes.
B
All the offspring will be completely solid.
C
All the offspring will be completely spotted.
D
All the offspring will have a mixture of spots and solid colors.
7

Which best describes a helpful genetic mutation?

A
a mutation that cannot be passed on to offspring
B
a mutation that increases an organism's chances of survival
C
a mutation that results in no change to the organism's physical appearance
D
a mutation that causes cells to divide rapidly and uncontrollably
8

The diagram represents part of Mendel's pea plant experiment. He crossed white-flowered pea plants with purple-flowered pea plants. Flower color has the same type of heredity as pea color.

Question illustration
A
one plant with white flowers and three with purple flowers
B
one plant with purple flowers and three with white flowers
C
four plants with white flowers
D
four plants with purple flowers
9

Which are ways of showing probability? Select 4 options.50%5571 × 10425%

Question illustration
A
50%
B
557
C
Option
Option C
D
1 × 104
E
25%
F
Option
Option F
10

Sandra is heterozygous for eye shape.What does this mean?

A
She has two of the same alleles for eye shape, one from each parent.
B
She has two different alleles for eye shape, one from each parent.
C
She has only one allele for eye shape, which she received from one parent.
D
She has two alleles for eye shape, both from the same parent.
11

Which examples are harmful mutations? Select two answers.one that causes a person to have a light patch of hair colorone that changes a mouse’s eye shape but not its eyesightone that allows a moth to blend into its environmentone that reduces a bean plant’s ability to make foodone that increases a plant’s susceptibility to disease

A
one that causes a person to have a light patch of hair color
B
one that changes a mouse’s eye shape but not its eyesight
C
one that allows a moth to blend into its environment
D
one that reduces a bean plant’s ability to make food
E
one that increases a plant’s susceptibility to disease
12

Artificial selection is another name for .

Answer not available
13

Which procedure is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele?

A
selective breeding
B
cloning
C
artificial selection
D
gene therapy
14

People living in some countries have a difficult time obtaining foods that are high in vitamin A.

A
higher tolerance of crops to temperature changes
B
decreased crop resistance to disease
C
lowered cost of food production
D
increased nutritional value of crops
15

In cats, having a short tail is recessive to having a long tail. If a mother cat is heterozygous for this trait and a father cat is homozygous dominant for having a long tail, what will most likely be true about their offspring?

A
All will have long tails.
B
All will have short tails.
C
About will have short tails.
Option C
D
About will have long tails.
Option D
16

Shira listed the steps for protein production in cells.1. A strand of RNA is made.2. RNA leaves the nucleus.3. RNA moves to the ribosome.4. A protein is made.

A
DNA unzips after step 1.
B
DNA unzips before step 1.
C
DNA is replicated after step 3.
D
DNA is replicated before step 3.
17

If someone has a dominant phenotype, their genotype can either be heterozygous or homozygous. The diagram shows a Punnett square for a particular trait among two parents, but one letter of a parent’s genotype is missing.

Question illustration
A
T because there are offspring that are heterozygous
B
T because there are offspring that are homozygous
C
t because there are offspring that are homozygous.
D
t because there are offspring that are heterozygous.
18

Which best describes a recessive allele?

A
always inherited from a parent when a dominant allele is inherited from the other parent
B
never inherited from a parent when a dominant allele is inherited from the other parent
C
only determines phenotype when a dominant allele for the same trait is present
D
does not determine phenotype when a dominant allele for the same trait is present
19

Which statement describes the blood type of a person with the alleles IAi?

A
It is type AB because I and i are codominant.
B
It is type AB because A and i are codominant.
C
It is type A because i is dominant and A is recessive.
D
It is type A because A is dominant and i is recessive.
20

Which best describes the offspring of a curly-haired dog (CC) with a straight-haired dog (SS), assuming incomplete dominance?

A
All the offspring will be hairless.
B
All the offspring will have straight hair.
C
All the offspring will have curly hair.
D
All the offspring will have wavy hair.

Did you find these answers helpful?