How is it possible for the cells produced by meiosis to have undergone two nuclear divisions but have a haploid

number of chromosomes? What will be an ideal response?


Concepts to Consider: This is possible because the first nuclear division is preceded by
duplication of the chromosomes, whereas the second nuclear division is not. As a result, the
ploidy of the cells after two divisions is exactly half that of the parental cell.

Biology & Microbiology

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Dana Reeve, the wife of actor Christopher Reeve, died at a young age from lung cancer, although she had never smoked. Her cancer was likely caused by

A) a germline mutation. B) two somatic mutations in the same lung cell. C) exposure to carcinogens. D) stress from caring for her husband, who had a spinal cord injury.

Biology & Microbiology

Caring for young by both parents is most

common in a. birds. b. amphibians. c. mammals. d. reptiles. e. amphibians and reptiles.

Biology & Microbiology

In your biology lab, you are given a vial that contains fish urine. Your assignment is to predict whether the urine came from a fresh- or saltwater species. You discover that the urine contains a high concentration of salts. What is your prediction for the fish's habitat? What is the concentration of solutes in the fish relative to its environment?

A. Marine; hypoosmotic B. Freshwater; hypoosmotic C. Freshwater; hyperosmotic D. Marine; hyperosmotic

Biology & Microbiology

In a food web, which of the following organisms would be considered heterotrophs? Select all that apply

A. decomposers B. consumers C. primary producers D. secondary consumers

Biology & Microbiology