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GENETICS EXAM 1 (CH 1-4) QUESTIONS AND ANSWERS
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GENETICS EXAM 1 (CH 1-4) QUESTIONS AND ANSWERS
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Name: Score:104 Multiple choice questions
Term 1 of 104
The coat color of calico cats is a result of _____.
maternal inheritance
x-inactivation
imprinting
extranuclear inheritance
Term 2 of 104
When Mendel crossed two plants that were heterozygous for a single trait, what was the
phenotypic ratio of their offspring?
a. 1 : 2 : 1
b. 9 : 3 : 3 : 1
c. 3 : 1
d. 7 : 4
e. varied depending on the trait
3:1
G1
genotype
Zygotena
,Term 3 of 104
a heterozygote possesses a phenotype that is intermediate between the homozygous
dominant and homozygous recessive phenotypes. This is most likely an example of ____.
codominance
incomplete dominance
incomplete penetrance
sex-influenced inheritance
Term 4 of 104
In eukaryotic cells, complex between DNA and proteins (histones)
chromosome
sister chromatids
chromatin
genotype
Term 5 of 104
The microtubules of the spindle fiber attach to the kinetochore.
nuclear membrane fragments into vesicles
kinetochore fibers capture or beginning to make contact with kinetochores at the centromeres
Telophase
G1
Anaphase
Prometaphase
,Term 6 of 104
How many Barr bodies would an individual with a XXY genotype possess?
o
1
2
none of the answers are correct
Term 7 of 104
Within a population this allele will kill some individuals, but not all (not well understood)
Conditional lethal alleles
Nonessential genes
Lethal allele
Semilethal alleles
Term 8 of 104
Categories of larger cellular molecules:
The types of vitamins and minerals necessary for cellular function
A classification of cellular waste products
Nucleic acids (DNA, RNA), Proteins, Carbohydrates and lipids
Conditional lethal alleles
Term 9 of 104
What is a merozygote?
a zygote with a maternal effect
prokaryotic cell that is haploid after binary fission
prokaryotic cell with wild and variant types of plasmids
prokaryotic cell without plasmids
, Term 10 of 104
Synaptonemal complex disappears
becomes easier to the 4 homologous chromatids also known as "tetrads"
chiasmata become visible
bivalent pulls apart slightly, and microscopically it becomes easier to see that it is composed
of four chromatids
in females, meosis is arrest at this stage when female embryos are 5 months and will not
resume process until puberty
Pachytena
Diplotena
Diakinesis
Zygotena
Term 11 of 104
If a geneticist describes a trait as being 70% penetrant, what would they mean?
the expression of the trait varies by individual
it is lethal in 30% of the individuals who have the trait
only 70% of the individuals who carry the trait express the trait
the trait is present in 70% of the population
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