Biology Unit 4 quiz 4
Terms in this set (24)
The complete diploid set of chromosomes grouped together in pairs, arranged in order of decreasing size.
when a chromosome is randomly switched off and condensed to form a dense region.
dominant lethal traits
traits when an individual that is homozygous dominant doesn't exist in the population
When you have a dominant lethal trait can you ever have an individual who is homozygous dominant?
gene mutation that involves changes in one or few nucleotides
4 types of chromosome mutations
Substitution: one base is changed to a different base. Insertions: one base is added to the DNA sequence. Deletion: one base is removed from the DNA sequence
Translocation: A segment of another chromosome inserts into a different chromosome
A mutation that changes a single nucleotide, but does not change the amino acid created.
Deletion, insertion, substitution.
three types of point mutations
when a gene duplicates on one chromosome
when a gene is deleted
when genes switch
when one part of a gene goes to another gene
when two chromosomes don't separate during meiosis
results of nondisunction
This can lead to three chromosomes in one space. There can also be only one, an extra x chromosome or one less x chromosome.
trisomy of the 21st chromosome
trisomy of chromosome 18
Turner's Syndrome (X0)
Monosomy X chromosome (X0)
Extra X chromosome XXY
Chemical or physical agents in the environment that cause mutation.
A condition in which an individual has three copies of a chromosome.
A condition in which an individual has one copy of a chromosome
The full set of genetic information that an organism carries in its DNA.
When two genes are close together, crossing- over is...
When two genes are far apart, crossing-over is...