Many of the color varieties of summer squash are determined by several interacting loci: AA or Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Assume that two fully heterozygous plants are crossed

Give the phenotypes (with frequencies) of the offspring.


12 (white):3 (yellow):1 (green)

Biology & Microbiology

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Type ________ hypersensitivity involves delayed, cell-mediated immune reactions.

A. I B. II C. IV D. III

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Which stage of development involves initial

cellular reorganization? a. gamete formation b. fertilization c. gastrulation d. organ formation e. tissue specialization

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What are the sources of sulfur in the atmosphere?

A) Mostly (over 90%) volcanoes and photosynthetic bacteria B) Mostly transportation modes, such as autos, trucks, and planes C) Volcanoes and hot springs, but mostly (about 75%) human activities such as burning coal D) Decomposition and small amounts from pollution E) Natural and human sources, in equal amounts

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Which of the following components of the immune system destroys bacteria in a way similar to an antitank weapon destroying armored military tanks by punching holes in the wall of the bacteria?

A) complement protein B) macrophages C) plasma cells D) major histocompatibility complex proteins

Biology & Microbiology