BIOL 1001 Chapter : Chapter 15

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azuremammoth471

15 Mar 2019

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15. 1 how are populations, genes, and evolution related: a. evolution is the change in the characteristics in a population over time, 1. A population is a group that includes all the members of a species living in a given area: b. Genes and the environment interact to determine traits: 1. Population of 25 hamsters contains 50 alleles of the coat color gene. The hardy weinberg principle is a mathematical model that can illustrate evolution: under the conditions the frequencies of alleles and genotypes in a sexually reproducing population remain constant from one generation to the next, 2. The equilibrium population is a non-evolving (idealized) one that must meet five conditions: a. There is not gene flow between populations: c. the population must be very large, d. all mating must be random, e. there is no natural selection, 3. 15. 2 what causes evolution: a. mutations are the original source of genetic variability, 1.

Related Questions

*Selection*	*Term*	*Description*
	Basal factors	a. bind to enhancers
	Activators	b. bind to promoters
	Coactivators	c. bind to activators
	Locus control region	d. large enzymatic complex found in the cytoplasm of alleukaryotic cells that down-regulates gene expression
	RISC	e. influences transcription from multiple genes linked over alarge region of DNA

*Selection*	*Term*	*Description*
	Gene pool	a. The process in which rare alleles increase in frequency in anew population
	Genetic drift	b. The sum total of all alleles carried in all members of apopulation
	Founder effect	c. The proportion of all copies of a gene in a population of aspecific type
	Evolutionary equilibrium	d. Unpredictable, chance fluctuation in allele frequency thathave a neutral effect on fitness
	Allele frequency	e. a balance between a new allele and selection against thatallele

champagnewallaby382

1.) Alterations in chromosome number can occur with any chromosome, but most alterations are not seen in human populations because:

A) the phenotype is homozygous recessive.

B) the phenotype is expressed in a continuous range in a given population and thus does not stand out.

C) they are lethal during fetal development.

D) most are corrected during the first mitotic event in the fertilized egg.

E) the genotype still represents a normal condition.

2.) Polygenic traits display phenotypes that

A) are most commonly reflective of the heterozygous condition.

B) usually express the dominate condition in greater than 75% of the population.

C) represent a continuous range within the population.

D) often are lethal to second generation of children.

E) are masked by a codominance condition.

3.) Which of the following is most likely involved in the determination of intelligence?

A) one gene

B) multiple genes

C) the environment

D) one gene and the environment

E) multiple genes and the environment

purplefox331

11.The evolutionary force of drift changes allele frequencies more quickly in which of the following kinds of populations?

a. large populations

b. small populations

10.Larger populations generate larger numbers of mutations.

True

False

9.Overdominance can result in changes in genotype frequencies, without changes in allele frequencies.

True

False

8.Protein coding genes usually evolve faster than pseudogenes.

True

False

7.Favorable mutations are not directly induced by environmenntal conditions where they increase fitness, instead they occur by chance, and if they happen to increase fitness, their frequency will increase in a population.

True

False

6.Consider a single gene with two alleles, A and a, in a population. What is the frequency of the Aa genotypes in zygotes drawn from a gene pool where A=0.3 and a=0.7, if they are in Hardy-Weinberg proportions?

1. 0.3

2. .09

3. 0.49

4. 0.42

5. 0.7

BIOL 1001 Chapter : Chapter 15

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