Tall (D) is dominant to dwarf (d). Give the F2 genotypic and phenotypic ratios of a cross between a

pure-breeding tall plant and a pure-breeding dwarf plant. What will be an ideal response?


1 DD, 2 Dd, 1 dd; 3 tall, 1 dwarf

Biology & Microbiology

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A bacterium containing ________ provided with hydrogen peroxide will produce oxygen bubbles

A) catalase B) superoxide dismutase C) superoxide reductase D) peroxidase

Biology & Microbiology

The human body is colonized by a variety of bacteria that reside in very specific sites or anatomical locations throughout. These organisms are classified as:

a. opportunistic pathogens. b. infectious organisms. c. normal resident organisms. d. normal human microbiota.

Biology & Microbiology

Briefly explain why animals that live in very dry climates have the longest nephron loops

What will be an ideal response?

Biology & Microbiology

In an experiment, Jokela et al. reared 14 replicate populations of a snail that is poly-morphic for sexual/asexual reproduction under controlled identical conditions in the lab

Each population started with 35% asexual and 65% sexual experiments. The figure be-low shows the proportions of asexual after a year-long experimental run. What are possible explanations for this result? a. All asexuals survived better under the experimental conditions. b. Asexual females produced more offspring per individual than sexual fe-males. c. The cost of males leads to faster population growth for the asexual sub-population. d. A novel mutation after the start of the experiment led to the increased sur-vival of the asexual line with the mutations. e. A, B, and C.

Biology & Microbiology