Red green color blindness is controlled by an x chromosomal gene in humans. a normal man and normal woman whose fathers are both color blind marry. what is the probability that their first child will be color blind

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

As a small change in a person's dna can cause a genetic disorder

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection