Identify the only correct statement regarding the heritability of a trait
1.Heritability of a particular trait can be calculated only in individuals, not in populations.
2.Heritability defines the genetic contribution to a trait in a population of relatives.
3.In heritability studies, the correlation coefficient is a measure of the total number of relatives affected by the trait.
4.Heritable traits are not affected by the environment.
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When chromosomes have either duplications or deletions, the chances that the mutation will be harmful are a function of:
A. its sizeâ€"the smaller the duplication or deletion, the greater the chance of harm. B. its sizeâ€"the larger the duplication or deletion, the greater the chance of harm. C. its locationâ€"if it occurs in a germ-line cell, it will be more harmful than if it occurs in a somatic cell. D. its position on the chromosomeâ€"if it occurs at the tip of a long arm, it is likely to be less harmful than if it occurs at the tip of a short arm. E. None of the answer options are correct.
A plant sustains pathogen-induced damage to one of its cell walls. A gene-for-gene response soon follows and the tissue surrounding the injury soon dies. Which signaling molecules facilitated this response?
A. Oligosaccharins B. Ethylene C. Gibberellins D. Auxins E. Abscisic acid Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about injury response in plants? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In an experiment to distinguish genetic versus environmental effects on a trait, the test individuals
A) should be as genetically related as possible. B) should have variable alleles at as many loci as possible. C) must have the same parents. D) must be grown in a natural environment.
Why do decreased testosterone levels in men lead to infertility?
a. lower testosterone prevents sperm from being made b. lower testosterone prevents sperm from maturing c. lower testosterone inhibits sperm motility d. lower testosterone prevents ejaculation e. lower testosterone prevents the removal of the coating on the head of the sperm