AnswersSY2025-26 - 2002070 MJ Comprehensive Science 2 Sem 1 CRUnit Test

The Theory of Evolution Answers

2 verified answers
1
Free Preview

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
2
Free Preview

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.
3

A fruit fly has black eyes. Having red eyes is a dominant trait (R) and having black eyes is a recessive trait (r).Which describes the fruit fly’s genotype and phenotype?

A
genotype: black eyesphenotype: Rr
B
genotype: black eyesphenotype: rr
C
genotype: rrphenotype: black eyes
D
genotype: Rrphenotype: black eyes
4

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.
6

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
7

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
8

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.
9

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
10

In humans, unattached earlobes are dominant over attached earlobes.

A
Ee
B
e
C
ee
D
E
11

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
12

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
13

Tall plants are dominant over short plants. One parent is homozygous dominant and the other is heterozygous for plant height. Which would most likely be the resulting phenotype of the offspring?

A
all tall
B
all short
C
3 tall and 1 short
D
2 tall and 2 short
14

A rose plant inherited two alleles for white flower petals.Which conclusion is best supported by the given information?

A
Each parent had at least one allele for white petals.
B
Each parent must have had more than one allele for white petals.
C
Only one parent had one allele for white petals.
D
Only one parent had two alleles for white petals.
15

What does an organism's phenotype describe?

A
the allele combination for a trait
B
the physical appearance of a trait
C
the number of alleles on a gene
D
the number of different traits inherited
16

The shapes are placed in a basket.

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
17

Which best compares genetic engineering and cloning of animals?

A
Both result in offspring with a single, specific desirable trait.
B
Both result in offspring that are genetically identical to the original organism.
C
Both require that DNA be manipulated in some way.
D
Both require that only females are used in the process.
18

The diagram shows two types of seeds.

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
19

The diagram shows a chromosome pair for an offspring.

Question illustration
A
An allele for eye color was inherited from only one parent.
B
An allele for hair type was inherited from only one parent.
C
The offspring is homozygous for eye color.
D
The offspring is homozygous for hair type.
20

Which would result a farmer in producing more food at a lower cost?

A
planting wheat that is resistant to weed killer
B
breeding pear trees that grow sweeter fruits
C
growing rice that only grows in warm climates
D
producing vegetable oil that has added vitamin A
21

Which describes a concept that was not previously known but was developed as a direct result of Mendel’s experiments with pea plants?

A
Organisms with a recessive trait can have a dominant allele for the trait.
B
All observable traits are dominant.
C
Organisms have more than one observable trait.
D
Organisms can be bred for specific traits based on a pattern of inheritance.

Did you find these answers helpful?

More from this Course

Quiz
8 verified answers

Unit Test

Quiz
1 verified answers

Living Things and the Environment

Assignment
6 verified answers

Lab: Natural Selection