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Lecture

BIO 1130 Lecture Notes - Microevolution, Genetic Drift, Disruptive Selection


Department
Biology
Course Code
BIO 1130
Professor
Jon Houseman

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Microevolution and Speciation
Across
Type of mutation that is more likely to increase variation in a population CHROMOSOMAL
Heavy selection pressure on a population cause one allele to become this FIXED
Type of mutation when only one nucleotide is changed POINT
Type of mutation where there is an addition of single nucleotide in the sequence FRAMESHIFT
The visible expression of the underlying genetic make up of an organism PHENOTYPE
Its anatomically impossible for two different species to physically mate, an example of this
type of isolation mechanism MECHANICAL
Alternate forms that a gene can take ALLELES
Evolutionary change that results from changes in allele frequencies MICROEVOLUTION
Inbreeding results in a decrease in this genetic mix HETEROZYGOTES
When the gene sequence along a chromosome changes from abcdefg to abefg DELETION
The copulatory wheel in dragonflies is an example of this type of male competition SPERM
Genetic drift isn't as likely in the size of a population LARGE
Males and females often look different it is an example of this type of dimorphism SEXUAL
Crossing over occurs during this type of cell division MEIOSIS
If allele frequencies are to be stable in a population this type of selection must not occur
NATURAL
Missense mutations rarely involve this nucleotide position in the codon THIRD
Type of mutation where single nucleotide change codes for the stop codon NONSENSE
Having more than the usual 2N set of chromosomes POLYPOID
Down
In this process sister chromatids on different chromosome pairs exchange DNA.
CROSSINGOVER
This part of the range of variation is selected for in disruptive selection MIDDLE
When the gene sequence along a chromosome changes from abcdefg to abcdecdefg
DUPLICATION
Type of mutation where single nucleotide changes alters only one codon MISSENSE
In some genetic crossed (RR x rr) the ratio of visible traits is 1:2:1 in the F1 generation with
two seemingly intermediate conditions. Its an example of this type of dominance
INCOMPLETE
Even though pollen (male gamete) from a varity of different plant species land on the stigma
(female) only those of the same species will ultimately fertilize the ovule (egg). Its an example of this
type of isolation mechanism. GAMETICISOLATION
Under normal circumstances the range of variation for a phenotype can be represented with this
type of curve. BELL
If both alleles for a character are the same the organism is considered to be this.
HOMOZYGOUS
If the alleles for a character are different, the organism is considered to be this for that trait.
HETERZYGOUS
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