A hypothetical population has two alleles for a gene: a and

a. in a random sample of 50 individuals, 20 are homozygous for a, 10 are homozygous for a, and 20 are heterozygous. what is the frequency of a?

Name two important features of a reflex action?

Name the process by which soluble food enters the blood

Describe three human activities that can disrupt the water cycle and what effect each one has

Which of these is a density-independent factor? A. Water B. Fire C. Food D. Space

What makes lipids different from other organic compounds? A. They make simple sugars. B. They are made of amino acids. C. They carry information and guard against invasion. D. They don't dissolve in water.

A farmer crossed a yellow maize plant (Yy) with another yellow maize plant (YY). He planted 200 seeds from this cross. How many of the plants would be yellow?

How do the methods of scientists lead to knowledge?

Actions you do without thinking about them

Joe begins to experience mood swings and disturbed thirst and hunger. Imaging studies indicate that a brain tumor is the likely cause of these disorders. In what part of the brain is the tumor most likely located?

How to use light in energy to make glucose?