Review Unit 2

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?

Which of the following will most likely decrease genetic diversity?

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?

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?

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?

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?

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

Which organism has the highest reproductive potential?

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

How many chromosomes are shown in a normal human karyotype?

What determines gender in humans?

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?

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?