If a skin cell has 30 chromosomes, then in the same organism, a sperm cell would have how many chromosomes? a. 15b. 60c. 120d. 30

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Explain why ecosystem diversity results in species diversity in a healthy biosphere