The gene for color blindness is a recessive allele located on the X chromosome. If a color-blind man and a color-blind woman have one son and three daughters, how many will be color-blind? 

A. all children will be color-blind
B. only the one son will be color-blind
C. only the three daughters will be color-blind
D. none of the children will be color-blind


A. all children will be color-blind

Biology & Microbiology

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Evidence shows that the earliest life may have existed how long ago?

a. 2 billion years ago b. 3.5 billion years ago c. 1.3 billion years ago

d. 630 million years ago e. 250 million years ago

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________ are complex communities of various types of microbes that adhere to surfaces

A) Aggregates B) Colonies C) Isolates D) Biofilms E) Media

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