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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
is the major component of cytoplasm
B
directly increases the solubility of nutrients
C
directs the production of enzymes
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
AO x BO
B
AO x BB
C
AA x BO
D
AB x OO
4) Which represents the genotype of a homozygous condition?
A
Fg
B
rr
C
Rr
D
PQ
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
dominance
B
segregation
C
crossing over
D
gene linkage
6) Chromosomes normally occur as homologous pairs in
A
a gamete
B
a sperm cell
C
an egg cell
D
a zygote
7) Because the gene for hemophilia is located on the X-chromosome, it is normally impossible for a
A
hemophiliac father to pass the gene to his daughter
B
hemophiliac father to pass the gene on to his son
C
carrier mother to pass the gene to her daughter
D
carrier mother to pass the gene to her 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
both type A and type O
B
type A
C
type O
D
neither A or O
9) The outward appearance (gene expression) of a particular trait in an organism is referred to as
A
a phenotype
B
an allele
C
a chromosome
D
a genotype
10) When many hybrid tall pea plants are cross-pollinated, the offspring produced will probably be
A
100% homozygous tall
B
50% heterozygous tall
C
50% homozygous tall
D
100% heterozygous tall
*select an answer for all questions
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