BCh.17 Study Guide

F, Disruptive
(Directional) selection tends to eliminate individuals with average phenotypic values in a population

F, Allele
The main source of changes in (phenotype) frequencies in a population is mutation in germ cells

Reduction of ability to adapt to environment; Production of genetically uniform offspring; Increased chance of homozygous recessive alleles occurring
Name a problem that does not arise from inbreeding

Can be considered separate species
According to the biological species concept, any populations that do not share future offspring

acts on
Natural selection : phenotypes ::

Alleles for a nonfunctional protein being passed on as a recessive allele
Which is a probable origin of many recessive genetic disorders?

Gene pool
Genetic variation and change are measured in terms of the frequency of alleles in the ? of a population

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Population genetics involves the study of

Asexual reproducers or species only know by their fossils
To which type of organism can the definition of species under the biological species concept not be applied?

Genetic variation
What condition absolutely must be present in a population before evolution can act upon it?

One extreme in a range of phenotypes
Directional selection tends to eliminate

They are not passed on to offspring
Why are mutations in body cells not a source of genetic variation?

Individuals must survive to reproduce, produce fertile offspring, and pass their genes on to future generations.
Interpret the following statement: “Evolutionary fitness is measured in grandchildren.”

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