Plants and algae most recently shared a common ancestor 480 million years ago, and plants colonized land shortly after that. Light, water, minerals, and dissolved gases surround the whole body of a submerged green alga, and the buoyancy of water provides physical support. What adaptation did plants have to make in taking up gasses without drying out when they moved to dry land?
a. Production of pollen
b. Development of stomata
c. Development of vascular tissue
d. Production of a cuticle
e. Production of lignin
Answer: b. Development of stomata
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In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY. When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes. Unexpectedly, all of these white-eyed F2 flies were males. Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele. Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females. In this case, a valid hypothesis would be
A. White eyes is caused by a recessive Y-linked allele. B. White eyes is caused by a dominant Y-linked allele. C. White eyes is caused by a dominant X-linked allele. D. White eyes is caused by a dominant autosomal allele. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about X-linked inheritance? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
Biology is more completely understood using an integrated approach as opposed to a compartmentalized approach
A. true B. false
Which of the following are the most abundant cells in adult bones?
A. Osteocytes B. Osteoblasts C. Red marrow D. Osteoclasts E. Yellow marrow
What is the distribution of phenotypes from a cross of purple tall pea plants that are heterozygous for flower color and plant height? (Purple is dominant to white; tall is dominant to dwarf.)
A. 27 purple dwarf; 28 purple tall; 31 white dwarf; 29 white tall B. 132 purple tall; 138 white dwarf C. 100% purple tall D. 54 purple tall; 6 white dwarf E. 63 purple tall; 28 purple tall; 27 white dwarf; 7 white dwarf