Describe how the previous assumption regarding the development of sexual identity and the treatment for ambiguous
genitalia has changed in recent ye What will be an ideal response?
ANSWER: Most scientists believed that children are psychosexually neutral at birth and that nurture had
more to do with sexual roles than nature. Males with a small or malformed penis were
surgically altered into females because in reconstructive genital surgery it is easier to make a
vagina than a penis. However, investigators have concluded that it is wrong to assume that
sexual identity is neutral at birth and that it can be shaped by the environment. This
conclusion was confirmed by studies of children born as males with ambiguous genitals and
surgically reassigned as females. Currently, guidelines for surgical sex reassignment use
karyotypes to establish chromosomal sex and the presence of ovaries or testes as major
considerations. Surgical reassignment of infants is now rarel
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Heirloom plants are treasured for their flavorful produce and true-breeding progeny that allow gardeners to avoid repeatedly purchasing seed from agribusiness conglomerates. What special effort is required to save seed from heirloom biennials such as carrots?
A. Since carrots produce large roots, they do not devote many resources to seed development. The roots must be trimmed before collecting seed. B. Since carrots build up so much beta-carotene, they do not devote many resources to seed development. A yellow carrot variety will produce better seeds than a darker one. C. Since carrots are related to wild weeds, they are often cross-pollinated. The green top must be bagged to ensure self-pollination. D. Biennials do not produce seed until the second year of growth. Although carrot roots are normally harvested after one season, they must be allowed to grow another year for seed collection. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about biennials? What other information is related to the question? Choose Answer Given what you now know, what information 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?
A change in DNA sequence arising from errors in replication that occur randomly is a(n)
A) spontaneous mutation. B) induced mutation. C) point mutation. D) nonsense mutation.
An organism that grows slowly in the cold but has an optimum growth temperature of 32°C is called
A. a psychrophile. B. an extremophile. C. a thermophile. D. a facultative psychrophile. E. thermoduric.
Which sequence correctly lists the different levels of biological organization, from the smallest and simplest to the largest and most complex?
(a). cells-organs-tissues-organ systems-organism (b). cells-tissues-organ systems-organs-organism (c). tissues-cells-organs-organ systems-organism (d). tissues-organs-organ systems-organisms-cells (e). cells-tissues-organs-organ systems-organisms