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Genetics Review
Test Description: Answer these questions about genetics
Instructions: Answer all questions to get your test result.
1) The presence of DNA is important for cellular metabolic activities because DNA
A
directs the production of enzymes
B
directly increases the solubility of nutrients
C
is the major component of cytoplasm
D
is a structural component of cell walls
2) In squirrels, the gene for gray fur (G) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are gray, the parental cross that produced this litter wa
A
gg x gg
B
Gg x gg
C
GG x Gg
D
GG x GG
3) Which cross could produce a child with type O blood?
A
AB x OO
B
AO x BO
C
AO x BB
D
AA x BO
4) Which represents the genotype of a homozygous condition?
A
PQ
B
rr
C
Rr
D
Fg
5) Geneticists have observed that fruit flies that commonly inherit vestigial wings also inherit lobed eyes. Observations such as this have helped to develop the genetic concept known
A
crossing over
B
dominance
C
gene linkage
D
segregation
6) Chromosomes normally occur as homologous pairs in
A
an egg cell
B
a gamete
C
a zygote
D
a sperm cell
7) Because the gene for hemophilia is located on the X-chromosome, it is normally impossible for a
A
carrier mother to pass the gene to her daughter
B
hemophiliac father to pass the gene to his daughter
C
carrier mother to pass the gene to her son
D
hemophiliac father to pass the gene on to his son
8) A man with a blood genotype AO marries a woman with a blood genotype of AO. What blood types could be expected in their children?
A
type O
B
both type A and type O
C
type A
D
neither A or O
9) The outward appearance (gene expression) of a particular trait in an organism is referred to as
A
a genotype
B
a phenotype
C
a chromosome
D
an allele
10) When many hybrid tall pea plants are cross-pollinated, the offspring produced will probably be
A
100% heterozygous tall
B
50% heterozygous tall
C
50% homozygous tall
D
100% homozygous tall
*select an answer for all questions
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