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What will the genotypic ratio be of a monohybrid cross of two individuals who are heterozygous for a trait? 

*It became apparent to Watson and Crick after completion of their model that the DNA molecule could carry a vast amount of hereditary information in its

Use the diagrams below to match each description (may be used more than once).

Aunt Lucy is preparing potato salad for a summer picnic. Unfortunately, when she pulls out the celery, it’s wilted and limp. Lucy’s sister, Carol, tells her to soak the lifeless celery in salt water to revive it. Lucy’s neighbor, Jeannie, tells her to use tap water, and Lucy’s mother, Samantha, pulls out the distilled water from under the bathroom sink. Which solution, if any, will help crisp the celery? Give a biologically relevant reason for your answer.

Which of these conditions are always true of populations evolving due to natural selection? Condition 1: The population must vary in traits that are heritable. Condition 2: Some heritable traits must increase reproductive success. Condition 3: Individuals pass on most traits that they acquire during their lifetime.

*A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these explanations best explains what happened?

In green plants, the primary function of the Calvin Cycle is to

In modern biochemical genetics, the flow of inherited information is from 

In guinea pigs, B = black, b = brown, S = short hair, s = long hair. Two heterozygous individuals reproduce. The expected results are 

*Which is not one of the preconditions in a population where natural selection is at work?