Which of these eye structures is responsible for allowing a person to see color?
A) sclera
B) cones
C) incus
D) rods
B
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Non-disjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. A cell biologist examines the final products of meiosis in an earthworm (2n=36) and finds 2 cells with 20 chromosomes, and 2 cells with 16 chromosomes. Most likely this was because
A. 2 pairs of sister chromatids failed to separate during meiosis II. B. 1 pair of sister chromatids failed to separate during meiosis II. C. 2 pairs of homologous chromosomes failed to separate during meiosis I. D. 1 pair of homologous chromosomes failed to separate during meiosis I. 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 non-disjunction? 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?
Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR) technique because it does not become inactivated at high temperatures
Indicate whether the statement is true or false.
________ is the hormone that stimulates the production of testosterone by the interstitial cells of the testis
Fill in the blank(s) with correct word
The opisthokonts include all of the following organisms EXCEPT
A. plants. B. fungi. C. choanoflagellates. D. animals.