Polyploidy instantly results in a
new plant species because it
Changes a species number of chromosomes
100
Gene regulation in eukaryotes
A. Usually involves operons
B. Is simpler that in prokaryotes
C. Allows for cell specialization
D. Includes the action of an
operator region
C. Allows for cell specialization
100
What is the ultimate source of
genetic variability?
mutations
100
Without _______ ________,horses
would not have been domesticated
Selective breeding
200
Which of the following is NOT a
gene mutation?
A. Inversion
B. Insertion
C. Deletion
D. Substitution
A. Inversion
200
The lac repressor releases the
operator in the presence of ______.
lactose
200
Luther Burbank produced over 800
varieties of plants by
selective breeding
200
A mutation in a series of genes called ______________ can change the organs that develop in specific parts of an embryo.
Hox genes
300
A mutation that involves one or a
few nucleotides is called a
point mutation
300
What is a mutation?
A change in a DNA sequence that affects genetic information
300
Which of the following is most
likely to bring together two recessive
alleles for a genetic defect?
A. Inbreeding
B. Hybridization
C. Genetic engineering
D. Transformation
A. Inbreeding
300
A typical gene consists of
regulatory sites, a _________, and
the nucleotide sequence that
is transcribed.
promoter
400
What is a polyploid organism?
One that has many sets of chromososmes
400
What might be the effect of a
mutation in the promoter sequence
of a gene?
RNA polymerase might be unable to bind to the promoter, and the gene would not be transcribed
400
To produce a fruit that has some
characteristics of an orange and
some of a grapefruit, you would
use the selective breeding
technique of ___________.
hybridization
400
Scientists use radiation and
chemicals to induce __________.
mutations
500
Why would breeders want to
increase a population’s
mutation rate?
It would increase the chances of individuals within the population having desirable traits, which can then be selected for using breeding techniques.
500
Why are hox genes that are found
in different animals very similar
to each other?
The hox genes descended from the genes of common ancestors.
500
How are the selective breeding
techniques of hybridization and
inbreeding opposites?
In hybridization, organisms with dissimilar traits are crossed. In inbreeding, organisms with similar traits are crossed.
500
Explain an advantage and a
disadvantage of inbreeding.
Advantage: it maintains desired traits within a breed.
Disadvantage: it can lead to genetic defects within a breed.