Which best describes the purpose of sexual reproduction?

A. to produce offspring that are non-viable
B. to produce offspring that are genetically indentical
C. to produce offspring that exhibit greater genetic variations
D. to produce offspring that are genetically identical to their parents


Ans: C. to produce offspring that exhibit greater genetic variations

Biology & Microbiology

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In mammals, Hox genes:

A. specify limbs and other structures associated with each body segment. B. direct development of structures that become parts of the hindbrain, spinal cord, and vertebral column. C. evolved by partial-genome duplication from the ancestral genes. D. are expressed in a sequence that does not reflect their linear order on the chromosome or the regions they affect. E. All of these choices are correct.

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Group 1 aquatic macroinvertebrates

(a) require high-quality, unpolluted water. (b) require polluted water. (c) are tolerant of a wide range of water quality conditions. (d) include leeches.

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Which of the following diseases is caused by a

flagellated protozoan?

a. cholera b. African sleeping sickness c. pertussis d. malaria e. more than one of these

Biology & Microbiology

Stem cells developed by inserting genes that regulate the transcription of specific genes into cells from an adult are ________ cells

A) induced pluripotent stem B) embryonic disk C) gastrula D) chorionic villi E) embryonic stem

Biology & Microbiology