hw #12 - Biology Honors Prentice Hall Textbook by...

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Biology Honors Prentice Hall Textbook by Miller/Levine Chapter 16 HW pg. 413 #1-34 pg. 415 #1-10 Period 2 #25 1. A 2. A 3. B 4. B 5. C 6. B 7. B 8. C 9. A 10. B 11. Relative frequency of an allele is the number of times that the allele occurs in a gene pool; compared with the number of times other alleles for the same gene occur. It is most often expressed in percentage. 12. The 23 chromosome pairs found in humans can produce 8.4 million different combinations of genes when forming gametes. Crossing-over further increases the number of different genotypes that can appear in offspring. When alleles are recombined during sexual reproduction, they can produce dramatically different phenotypes. Thus, sexual reproduction is a major source of variation within many populations. 13. The number of phenotypes produced for a given trait depends on how many genes control the trait. 14. A single-gene trait is a trait controlled by a single gene that has two alleles. Any variation in this gene leads to only two distinct phenotypes. 15. Polygenic traits cause a bell-shaped curve because there are many phenotypes that are average (which is around the top of the curve), but there are also many phenotypes that are extremes (and are at the bottom of the curve). 16. Evolution is any change over time in the relative frequencies of alleles in a population. Populations, not individuals, evolve over time. 17. Reproductive isolation is a type of speciation, and speciation is the formation of a new species. Reproductive isolation is when the male and the female choose their mates carefully, and they will not
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This note was uploaded on 01/02/2012 for the course BIO 101 taught by Professor Dr.chan during the Fall '11 term at Marine Biological Laboratory.

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hw #12 - Biology Honors Prentice Hall Textbook by...

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