Explain why water must be present for the bryophytes to complete the sexual portion of their life cycle.
What will be an ideal response?
The bryophytes have flagellated sperm that must swim to the female organ to effect fertilization.
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Which animal is likely to have the lowest expression level of a Pax6-like gene?
A. A surface-dwelling population of Astyanax mexicanus fish B. A cave-dwelling population of Astyanax mexicanus fish C. A fruit fly, Drosophila melanogaster D. A ribbonworm (Lineus sanguineus) developing normally E. A ribbonworm (Lineus sanguineus) with a regenerating head 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 the gene Pax6? 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?
Which statement correctly describes the X and/or Y chromosomes?
a. The X and Y chromosomes are completely homologous. b. The Y chromosome determines the sex of the individual. c. The Y chromosome is larger than the X chromosome. d. The Y chromosome is found in both males and females. e. The X chromosome only comes from the father.
Earth has a constant tilt of _____ on its axis from its plane of orbit.
A. 5.5° B. 9° C. 12.5° D. 23.5° E. 30°
Parallel venation is characteristic of eudicot leaves. Indicate whether the statement is true or false