Because he was well aware of the effect his theory of evolution would have on the Church of England, Darwin delayed published his work for several decades while he gathered additional evidence. Which of the following lines of evidence did he use to support his theory?
A. Artificial selection can produce organisms that differ markedly from their wild ancestors, and island species around the world all appear to be related to each other.
B. Adaptations to specific environments increase an organism's ability to survive an reproduce, and organisms seem to reproduce, and organisms seem to produce only as many offspring as the environment can support.
C. All species are capable of producing more offspring than the environment can support, and artificial selection can produce organisms that differ from their wild ancestors.
D. Some individuals leave more descedents than other individuals, but the individuals, but the individuals in a population are essentially identical to each other.
E. None of the above
Answer: A. Artificial selection can produce organisms that differ markedly from their wild ancestors, and island species around the world all appear to be related to each other.
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How many tetrads are present in a single elephant cell (2n=56) during metaphase I of meiosis?
What will be an ideal response? 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 know about tetrads? 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?
Which of the following statements correctly describes a quantitative trait?
A. People who are homozygous for the group of genes associated with skin pigment have either lighter or darker skin than those who are heterozygous for those genes. B. The alleles of the gene for red hair color is masked by the gene for brown hair color. C. A person heterozygous for dwarfism will always have the dwarf phenotype. D. A woman who has one allele for color blindness will not be color blind, but a man who has one allele for color blindness will be color blind. E. 25% of the offspring from a cross of two fruit flies that are heterozygous for curly wings will have curly wings.
In the cell cytoplasm, molecules of ATP are a ________.
A. solute B. solvent
A Gram stain of a wound reveals purple, spherical bacteria that divide and remain attached in grapelike clusters. These are referred to as
a. gram-positive streptococci b. gram-negative spirochetes c. gram-positive tetrads d. gram-positive staphylococci