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Genetics
Test Description: Answer the questions and fill out your study guide.
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1) Tongue rolling is dominant. If a heterozygous tongue roller and a non-tongue roller have a child, what are the chances the child will be a non-tongue roller?
A
0.75
B
0.25
C
0
D
0.5
2) In a cross of heterozygous RW four o'clock plants (RW x RW) what proportion of the seeds will grow to produce pink flowers?
A
0.25
B
0.75
C
0
D
0.5
3) What are the possible gametes produced by the individual SsYy?
A
SS, Ss, YY, and Yy
B
Ss and Yy
C
SY and Sy
D
SY, Sy, sY, and sy
4) Which of Mendel's laws can be demonstrated by a dihybrid cross?
A
The law of averages
B
The law of independent assortment
C
The law of segregation
D
The law of dominance
5) What do geneticists call alleles that are both expressed in the phenotype when they are together?
A
hybrids
B
heterozygous
C
incomplete dominance
D
codominance
6) If two parents whoes blood types are both B produce a child that has blood type O, what can you say about the parent's genotypes?
A
Both are lBi
B
one is ii
C
Nothing, this is impossible
D
one is lBi
7) What are the possible blood types among the children of parents that are IAIB and ii?
A
types A, B, and O
B
types A, B, and AB
C
types A, B, AB, and O
D
types A and B
8) With a mother that is colorblind and a father that is not colorblind, what is the probability that a male child is colorblind?
A
1/2
B
1/4
C
1
D
0
9) A mother that carries the colorblind allele and a father with normal vision can have children that are only
A
colorblind girls and colorblind boys
B
normal boys, normal girls, and colorblind girls
C
normal boys and normal girls
D
normal girls, normal boys, and colorblind boys
10) If a characteristic is X-linked it
A
occurs mostly in males
B
is always fatal
C
occurs mostly in females
D
isn't any different than a normal allele
*select an answer for all questions
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