Would you recommend a couple in which the male is infertile to seek genetic counseling? Why or why not? What will be an ideal response?
ANSWER: Answers will vary.
Background:For
some cases of male infertility, many couples now use a variation of IVF called
intracytoplasmic sperm injection (ICSI). ICSI is used mostly in cases where low sperm count
or motility problems are present. When ICSI is used in ART, there is an increased risk of
transmitting genetic defects to male children. About 13% of infertile males with a low sperm
count carry a small deletion on the Y chromosome. With ICSI, this form of infertility is
passed on to their sons. The same is true for some chromosomal abnormalities, such as
Klinefelter syndrome. Questions arise as to whether it is ethical to use ICSI to produce sons
who will be infertile.
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Are bat wings and bird wings homologous or homoplastic structures?
_____ As examples of vertebrate forelimbs, they are homologous, but as wings they are homoplastic. _____ As examples of vertebrate forelimbs, they are homoplastic, but as wings they are homologous. _____ As vertebrate forelimbs and as wings, they are homologous. _____ As vertebrate forelimbs and as wings, they are homoplastic. 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 homology? 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 about tunicates is incorrect?
A. Tunicates are nonvertebrate chordates. B. Tunicates are all marine animals. C. Tunicates are sessile as adults. D. Tunicate larvae are tadpole-like with all of the basic chordate characteristics. E. Tunicate larvae can reproduce.
Mammals have opposing groups of muscles at a joint; for example, the ________ flexes the forearm and the ________ extends it
a. biceps / triceps b. triceps / deltoid c. deltoid / pectoralis d. pectoralis / triceps
Which of the following descriptions is consistent with the behavior of a cell that lacks a protein required for a checkpoint mechanism that operates in G2?
(a) The cell would be unable to enter M phase. (b) The cell would be unable to enter G2. (c) The cell would enter M phase under conditions when normal cells would not. (d) The cell would pass through M phase more slowly than normal cells