What is a fixed allele

Which was the most likely food source for the terrestrial tetrapods?

New technology is important to the development of theories because it allows for repeated experimentation. enables the publication of new research. replaces theories that are old and hard to test. provides a new way to acquire new information.

Endorphins increase basal metabolic rate. increase muscle mass. reduce appetite. reduce carbohydrate cravings.

Explain the role of co-dominant alleles in human ABO blood groups.

Heterozygote advantage refers to the tendency for heterozygous individuals to have better fitness than homozygous individuals. This higher fitness results in less genetic variation in the population. a) trueb) false

Which type of environmental scientist is most likely to study how whales are affected by pollution? a. Hydrologist b. Toxicologist c. Ecologist d. Oceanographer

How did Francesco Redi disprove the idea of spontaneous generation? He showed that flies were not produced by meat. He showed that microorganisms are present in air. He showed that microorganisms cause disease. He showed that flies spread disease.

Of the millions of sperm who start the long journey to the egg, how many sperm are actually allowed to enter the egg?

A mineral leaves a gray trail when scraped against an unglazed porcelain plate. Which property of a mineral is being measured? A. luster B. streak C. color D. hardness

Which two systems in the human body are devoted exclusively to the regulation of organ function?