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WorksheetsGentics Quiz
Total questions: 20
Worksheet time: 20mins
Name
Class
Date
1.
1. Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
2.
2. Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
3.
3. AA is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
4.
4. Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
5.
5. bb is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
6.
6. Which of the following is a genotype?
a)
long hair
b)
blue eyes
c)
Gg
d)
tall
7.
7. Which of the following is a phenotype?
a)
AA
b)
AB
c)
black fur
d)
Tt
8.
8. Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?
a)
100% Pp (purple)
b)
50% Pp (purple); 50% pp (white)
c)
75% Pp (purple); 25% pp (white)
d)
25% PP, 50% Pp, 25% pp
75% purple, 25% white
75% purple, 25% white
9.
9. Brown is dominant (B) to blue (b). A heterozygous brown eyed father has a baby witha a heterozygous brown eyed mother. What is the probability their children will have blue eyes?
a)
0 %
b)
25%
c)
50%
d)
75%
10.
10. T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
11.
11. If a heterozygous tall pea plant is crossed with a short pea plant, what are the possible genotypes of the future offspring?
a)
100% Tt
b)
50% Tt, 50% tt
c)
75%Tt, 25%tt
d)
25%TT, 50%Tt, 25%tt
12.
12. If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
13.
13. Dimples in a child is a dominant trait. If a mother with no dimples had a child with a father who is heterozygous for having dimples. What is the probability that the child WOULD have dimples?
a)
50% dimples
b)
25% dimples
c)
100 % dimples
d)
50% no dimples
14.
14. Imagine two heterozygous parents. Each has a dominant allele B for brown eyes and a recessive allele b for blue eyes. The phenotypic ratio for brown:blue eyes in their children is
a)
1:2:1
b)
3:1
c)
9:3:3:1
d)
1:3:1
15.
15.
B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
B=brown eyes
b= blue eyes
What is true about these two brothers that have brown eyes:
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
16.
What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
17.
What is the genotype for a pea plant heterozygous for round seeds (R), and homozygous recessive for green seeds (y)?
a)
Ry
b)
RRyy
c)
RrYy
d)
Rryy
18.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
19.
Cross Two Homozygous plants
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
(RRYY x rryy)
R = round seeds, r = wrinkled seeds Y = yellow seeds, y = green seeds
What percent will have Round and Yellow seeds?
a)
0%
b)
25%
c)
50%
d)
100%
20.
A male beetle has the genotype Ttbb. If this beetle mates with a female with genotype TTBb, what is the chance their offspring will have the genotype TtBb?
a)
12.5%
b)
25%
c)
50%
d)
75%
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