Chromosomes can exchange genetic information during a process called "crossing over." This occurs when homologous chromosomes are lined up in pairs.

When does this happen?

Animal a and animal b each have 95% of there DNA in common. Animal a and animal c each had 50% in common. How does this support the hypothesis that life changed over time

A family of plants high in protein is: 1. Legumes? 2. Grasses? 3. Trees? 4. Mushrooms?

Why is the pancreas considered part of the immune system

How does cell growth affect the cell's surface-to-volume ratio?

Suppose a researcher for a pest-control company developed a chemical that inhibited the development of an embryonic mosquito's endodermal cells. Which of the following would be a likely mechanism by which this pesticide works? A.

Which route represents the path taken by the European explorer Christopher Columbus? A) 1 B) 2 C) 3 D) 4

Which gas is the most abundant of the trace gases? A. nitrogen B. oxygen C. argon D. carbon dioxide

Describe the central dogma of molecular biology, briefly describe the processes of transcription and translation.

magine that the animal body produced sperm and eggs with mitosis instead of meiosis. What chromosome number would the autosomes of the third generation have if the first generation had four chromosomes

A well supported testable explanation of phenomena that have occurred in the natural world is called