Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433769
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 2TYU
No two people are genetically identical, except for identical twins. The main source of
- A. new mutations that occurred in the preceding generation.
- B. genetic drift.
- C. the reshuffling of alleles in sexual reproduction.
- D. environmental effects.
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Students have asked these similar questions
A gene pool is
a. all of the genes in a single individual.
b. all of the genes in the gametes from a single individual.
c. all of the genes in a population of individuals.
d. the random mixing of genes during sexual reproduction.
Sexual reproduction provides an advantage to organisms because it increases the
A.
size of the genome of a species.
B.
genetic variability in a population.
C.
fitness of individual alleles of a gene.
D.
number of mutations during cell division.
Identify the most accurate statement about population variation.
a.
Allopolyploidy occurs when chromosomes fail to separate during gametogenesis and then self-fertilization results in a tetraploid offspring.
b.
Chromosomal duplications and deletions cause large changes due to the changes in gene dosage.
c.
Traits that are influenced by both environment and genetics are unlikely to be influenced by evolution.
d.
Gene duplications and deletions occur frequently during equal crossing over that occurs during meiosis I.
Chapter 21 Solutions
Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
Ch. 21.1 - Explain why genetic variation within a population...Ch. 21.1 - Of all the mutations that occur in a population,...Ch. 21.1 - Prob. 3CCCh. 21.2 - A population has 700 individuals, 85 of genotype...Ch. 21.2 - The frequency of allele a is 0.45 for a population...Ch. 21.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 21.3 - In what sense is natural selection more...Ch. 21.3 - Distinguish genetic drift from gene flow in terms...Ch. 21.3 - WHAT IF? Suppose two plant populations exchange...Ch. 21.4 - What is the relative fitness of a sterile mule?...
Ch. 21.4 - Explain why natural selection is the only...Ch. 21.4 - Prob. 3CCCh. 21 - Natural selection changes allele frequencies...Ch. 21 - No two people are genetically identical, except...Ch. 21 - Sparrows With average-sized w1ngs survive severe...Ch. 21 - If the nucleotide variability of a locus equals...Ch. 21 - There are 25 individuals in population 1, all with...Ch. 21 - A fruit fly population has a gene with two...Ch. 21 - FOCUS ON EVOLUTION Using at least TWO examples,...Ch. 21 - Prob. 9TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
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- Of the following, which is the least plausible hypothesis for why natural selection has not eliminated genes for male homosexuality? a. Perhaps the relatives of a homosexual male have more than an average number of children. b. Homosexual people might spread their genes by helping their brothers and sisters rear their children. c. Maybe there is no gene for homosexuality. Instead, an environmental event produces an epigenetic effect that can be transmitted from one generation to the next. d. Some homosexual men have children.arrow_forwardWhich of the following is false? a. The color of a fruit fly's eyes is a trait. b. The instructions for producing a trait are found in a gene that controls the physical expression of that trait. c. A gene can have different alleles that can specify different traits, such as red or brown eye color. d. The trait is influenced by the gene, independent of the environment. e. By studying the patterns of traits over generations of an organism, the genetic composition of an organism can be deduced.arrow_forwardWhich of the following individuals would be considered to have the greatest evolutionary fitness? a. Olympic speed skater with one child b. an overweight person with three children c. a woman who had six children, none of whom (the children) survived to adulthood d. a single mom who adopted eight childrenarrow_forward
- A. When Dr. Linda Fedigan conducted her studies on menopause, she collected data from the following sources: a. data collected on seven primate species. b. data collected on her studies of macaques. c. all of the above d. ethnographic data from traditional societies. B. several problems that may arise when geneticists undertake studies on indigenous persons without understanding their culture. Which of the following is one of these problems? a. People had samples taken without their knowledge, during surgeries. b. Samples were later used for other studies that were not authorized. c. Samples are being used to produce cures, but no money is given back. d. All of the above are truearrow_forwardHuman height shows a continuous variation from the very short to the very tall. Height is most likely controlled bya. epistatic genes.b. environmental factors.c. sex-linked genes.d. multiple genes.arrow_forwardWhich of the following is the definition of the term named Homozygous? a.Refers to genes that have identical alleles b.Genetic constitution of an organism c.Alternative form of a gene d.Trait expressed in the F1 generation e.Fundamental physical and functional unit of heredity f.Physical expression of traits of an organismarrow_forward
- The twofold cost of sex model by John Mynard Smith explains how - A. asexual females can become predominant in a population. B. anisogamy results in sexual reproduction. C. sexual individuals can produce genetically variant offspring. D. asexual females invest as much in offspring as the sexual females.arrow_forwardIf you continue with biological studies in the future, you are most likely going to carry out fruit fly experiments. Drosophila melanogaster are used in genetics labs due to how inexpensive they are, how visible their traits are, and their high reproductive rate. In Drosophila, the gene for red and white eye colour is found on the X chromosome. The allele for red eyes (XR) is dominant to the allele for white eyes (Xr). You are asked to cross a pure breeding white-eyed female with a pure breeding red-eyed male. What are the genotypes of the individuals involved in this cross? XRXR XRXr XRX- XrXr XRY XrY Genotype of the parent male Answer Genotype of the parent female Answer Genotype of the male offspring Answer Genotype of the female offspring Answerarrow_forwardOne of the key ingredients of evolution by natural selection is variation. Within a population, evolution by natural selection will occur if there is a selective advantage of one variation over another. What are the sources of variation in living populations? Select all that apply. a random mutations to DNA when DNA replicates in reproductive cells b environmental factors that may mutate DNA in gametes c mutations in somatic cells d crossing over during meiosisarrow_forward
- The whiptail lizard is an all-female population in which an individual lizard reproduces by cloning itself (by a process called parthenogenesis). Because of this, all surviving whiptail lizards are clones of one another. Which of the following statements is true? I. The absence of sexual reproduction conserves resources and allows the population to thrive better overall. II. The absence of sexual reproduction conserves resources but is detrimental to the long-term survival of the species. III. All members of the population are equally susceptible to parasites and disease. IV. The population can easily adapt to any environmental change. A. I only B. II only C. IV only D. II and IIIarrow_forwardEusociality and haplo-diploidy, in ants and bees, are often (though not always) correlated because… Group of answer choices: A. having twice as many genes allows queens to be far more capable of controlling other individuals. B. being able to control the sex of offspring allows parents to regulate the amount of cooperation. C. a worker can have more of her genes passed on in a new sister than in an offspring of her own. D. males have fathers but females don’t. E. it allows high levels of inbreeding to evolve without negative effects.arrow_forwardPlease read the scenario below and answer the question (in bold) that follows: In humans, the ability to roll one's tongue is a dominant trait (T). A woman who can roll her tongue is married to a man who cannot roll his tongue. The couple's daughter, Nia, can roll her tongue though their son, Michael, cannot. What is the genotype of the mother? a. TT b. Tt c. tt d. Either A or B e. Either B or Carrow_forward
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