Review Unit 2

Review: Unit 1

Day 2 Review

Multiple Choice

Patricia breeds rabbits to sell as pets. She noticed that rabbits with longer, softer ears sell better than those with short ears. Which best describes what Patricia should do to sell the most rabbits?

• Patricia should breed together a rabbit with soft fur and a rabbit with rough fur.

• Patricia should breed the rabbits with the longest, softest ears together.

• Patricia should breed together a rabbit with black fur and a rabbit with white fur.

• Patricia should breed a rabbit with long, soft ears with a rabbit with short ears.

Artificial Selection/ Selective Breeding

• Definition in your own words?

• Is artificial selection considered sexual or asexual reproduction?

• What is another example for selective breeding?

Multiple Choice

Which of the following will most likely decrease genetic diversity?

• increased reproduction

• selective breeding

• mutations

• immigration

Why would artificial selection decrease genetic variation?

• What is the purpose of artificial selection?

• Genetic variation: Individuals in a population are not exactly the same

Multiple Choice

The modern domesticated dog is thought to be descended from the wild wolf. There are currently many breeds of domesticated dogs which vary greatly in appearance. Which of the following best describes how the modern day dog has changed from its ancestor, the wolf?

• Humans have cloned dogs for desirable traits, causing many differences among breeds.

• Humans have bred dogs for desirable traits, causing many differences among breeds.

• The modern dog gradually changed over time due to natural selection.

• The modern dog quickly changed due to extinction.

How is artificial selection different than natural selection?

• What is natural selection?

• What is an example of natural selection?

Multiple Choice

During the 1800s, Gregor Mendel conducted experiments with pea plants. His work showed that organisms inherit traits from their parents and that some traits are dominant over others. Mendel's work was ignored for a long time because scientists could not explain how traits were carried from one generation to the next. What discovery provided scientists with a way to explain Mendel's work?

• ribonucleic acids

• cells

• atoms

• Punnett squares

Multiple Choice

In human beings, having unattached earlobes (A) is a dominant characteristic over attached earlobes (a). The Punnett square shows the genetic distribution of two parents, one with attached earlobes and one with unattached earlobes.

What is the chance that their offspring will have unattached earlobes?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

A homozygous brown mouse mates with a heterozygous brown mouse. The allele for brown fur (B) is dominant over the allele for tan fur (b). What percentage of the offspring will most likely have brown fur?

• 25%

• 50%

• 75%

• 100%

Multiple Choice

How does an offspring produced by asexual reproduction compare to the parent organism?

• Its genetic information is completely different from the parent organism.

• It contains 1/4 of the genetic information from the parent organism.

• It contains 1/3 of the genetic information from the parent organism.

• All of its genetic information is the same as the parent organism.

Asexual vs Sexual Reproduction

• What are some differences?

Multiple Choice

Which organism has the highest reproductive potential?

• bacteria

• elephant

• human

• sea turtle

Multiple Choice

A green-seeded pea plant and a yellow-seeded pea plant have offspring with all yellow seeds. What is the most likely reason?

• The offspring only inherited genes from the yellow-seeded parent.

• The offspring inherited more genes from the yellow-seeded parent.

• The genes from the yellow-seeded parent were dominant.

• The genes from the yellow-seeded parent were recessive.

Multiple Choice

How many chromosomes are shown in a normal human karyotype?

• 2

• 23

• 44

• 46

Multiple Choice

What determines gender in humans?

• only the X chromosome

• the X and Y chromosomes

• chromosome 21

• epistasis

Multiple Choice

The picture shows an animal cell with structures X and Y labeled.

Which of the following best explains the relationship between structures X and Y?

• X, chromosomes, are located inside Y, the nucleus, and these structures store genetic material for the cell.

• X, ribosomes, are located inside Y, the nucleus, and these structures provide protection for the cell.

• X, nuclei, are located inside Y, chromosomes, and these structures provide energy for the cell.

• X, chromosomes, are located inside Y, DNA, and these structures store proteins for the cell.

Multiple Choice

Some horses are bred for speed, while other horses are bred for pulling heavy loads. What is the main influence on whether a horse will become a racehorse or a farm horse?

• the diet and care it receives

• the training it receives after birth

• the environment it is raised in

• the genes it inherits from its parents