BIO 140 Chapter 27 Connect Concepts
Which of the following correctly defines a population of sexually reproducing species for the purposes of population genetics?
A group of individuals that occupy the same area and can interbreed with each other
Consider a population of cheetahs, inhabiting a protected area in Africa. In 2012, there were 112 cheetahs in this population. During that year, 60 of these animals reproduced and 48 new cubs were born. What constitutes the gene pool of the new generation made of those 48 new cubs?
All of the alleles of all of the genes that were passed from the 60 parents to the 48 new cubs.
Consider a population of crickets that occupies two fields separated by a road and two ditches. Crickets inhabiting the two fields comprise two local populations, or demes. What is the likelihood that a cricket will reproduce within its own deme compared to the likelihood a cricket will reproduce with a cricket from the other deme?
The likelihood of reproducing within a deme is much higher than the likelihood of reproduction between demes.
Which of the following are factors that can cause a change in the size of a population from one generation to the next?
Diseases, Natural disasters, and predators
Population genetics is concerned with the
extent of genetic variation within a group of individuals
The _________ ___________ of a population consists of all of the alleles of every gene in all of the individuals of that population.
gene pool
A change in one nucleotide in a gene is also known as a ________________-nucleotide , ____________or, SNP.
single, polymorphism
Consider a population, for which you know the allele composition of three genes. Gene A has three alleles in the following proportions: A1 - 34.4%, A2 - 30%, A3 - 35.6%. Gene B has two alleles in the following proportions: B1 - 67.1%, B2 - 32.9%. Gene C has two alleles in the following proportions: C1 - 99.2%, C2 - 0.8%. Which of those genes is(are) polymorphic?
A and B only
Consider the following types of changes in DNA: a deletion of part of a gene (A); a duplication of a region in a gene (B); a replacement of one nucleotide with a different one (C). Which of those changes can cause polymorphisms in a population?
A, B, and C
T/F: In a large population made of several local population is roughly the same as the likelihood of breeding with an individual from a different local population
False
Natural populations are dynamic entities. From the list below choose features of populations that can change from one generation to the next.
Genetic composition, Geographic location, size
How is the allele frequency of a population calculated? Multiple choice question.
The number of copies of the allele in the population is divided by the total number of all the alleles for the same gene in the population.
In population genetics, a gene that exists as two or more alleles in a population is a(n) ______ gene, while one that exists predominantly as a single allele is a(n) ______ gene.
polymorphic; monomorphic
Most of the traits in a healthy natural population exhibit some level of variation, or ______________, that is, they are found in two or more forms
polymorphism
When scientists study populations, they typically observe high levels of variation in many of the traits that characterize a species. In genetics, variations in traits at the population level are known as __________.
polymorphisms
The genetics field that is concerned with the extent of genetic variation within a group of individuals and changes in that variation over time is __________________________ genetics
population
A large, healthy, natural population typically exhibits a ______ level of SNPs.
high
In genetics, a _________ of a sexually reproducing species consists of a group of individuals of that species, which occupy the same region, and can successfully interbreed with each other
population
