Memorize These Answers!!!

The variety of genes and alleles that exist in organisms

• independent assortment

• chromosomal abnormalities

• genetic diversity

• mutations

Crossing over is important because....

• It prevents mutations from entering the gametes. 
• It allows for even distribution of chromosomes in the gametes.
• It allows for more genetic diversity of gametes.
• It allows for genetic uniformity of gametes. 

Which process is shown in the image?

• crossing over

• independent assortment

• segregation

• mutation

Five hundred years after the deer had established a flourishing population in the park, a few of them venture back to their original woods and have babies with the deer there.

• Genetic Drift
• Mutations
• Non-random mating
• Gene flow

Charles Darwin said all that species share:

• a common ancestor

• the same DNA

• the same species

• a home

By looking at the genes of some animals we can determine which living species are most closely related to each other. This also reveals which species most recently diverged from their common ancestor.

Based on the partial gene segments shown, which pair of animals are genetically most closely related and therefore most recently diverged from their common ancestor?

• Chimpanzee and Mouse

• Rat and Mouse

• Rat and Chimpanzee

Images of the embryo and adult stages of three different organisms are shown.

Which of the following is the best conclusion that can be drawn from this evidence?

• Having similar embryos indicates that these organisms eat the same types of food.

• Having similar embryos indicates that these organisms live in a similar environment.

• Having similar embryos indicates that these organisms share a recent common ancestor.

• Having similar embryos indicates that a certain protein controls how many legs the adult organisms will have.

Researchers discovered that the legs of birds are homologous to the feet of reptiles. Which claim is BEST supported by this fact?

• Birds do not require legs

• Birds and reptiles have a common ancestor

• They randomly developed the same structures

• Selection pressures have acted on birds, but not on reptiles

Humans, birds, whales, and lizards all have similar arm bones. What is the reason for this?

• The function of these bones is the same in all animals
• They live in similar environments
• They have a common ancestor
• All organisms resemble humans

The structures shown are_________

• homologous
• heterologous
• analogous
• vestigial