A cross between two pea plants produces a population of 732 purple and 268 white plants. What is the genotype and phenotype of the parents that produced this population?
A. both parents heterozygous purple
B. one parent homozygous purple, second parent homozygous white
C. one parent heterozygous purple, second parent heterozygous white
D. one parent heterozygous purple, second parent homozygous white
E. one parent homozygous purple, second parent heterozygous white
A. both parents heterozygous purple
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In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett
square shown, what were the phenotypes of the parental plants that were used in this cross by Mendel? A) Rryy and RrYy B) Rryy and rrYy C) RRyy and rryy D) RrYy and RrYy
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?
Which of the following is the main form of nitrogenous wastes released by mammals to their
environment?
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
Bacterial cells are prokaryotic. Unlike a typical eukaryotic cell they __________.
Fill in the blank(s) with the appropriate word(s).