WorksheetsGenetics Punnett Square Practice
Total questions: 40
Worksheet time: 1hrs 3mins
In dogs coat color is a monohybrid trait. Dominant dogs have brown fur, and recessive dogs have white fur.
What is the genotypic ratio of a heterozygous dog x recessive dog?
2:2
1:2:1
3:1
4
In dogs coat color is a monohybrid trait. Dominant dogs have brown fur, and recessive dogs have white fur.
What is the phenotypic ratio of a heterozygous dog x recessive dog?
2:2
1:2:1
3:1
4
Which of the following is an example of a heterozygous genotype?
AA
Aa
aa
Which of the following is an example of a recessive genotype?
AA
Aa
aa
Which of the following is an example of a homozygous dominant genotype?
AA
Aa
aa
Which type of traits do you see more often in nature?
dominant
recessive
How many copies of an allele do you need to have to have a recessive trait?
two recessive
two dominant
one dominant and one recessive
In flowers petal color is incompletely dominant, does that mean the flowers are speckled or bleneded?
speckled
blended
In flowers petal color is incompletely dominant, RR = red, rr = white and Rr = what color?
red
pink
white
In flowers petal color is incompletely dominant, RR = red, rr = white.
Cross two heterozygous flowers. What is the genotypic ratio?
1:2:1
2:2
4
3:1
In flowers petal color is incompletely dominant, RR = red, rr = white.
Cross two heterozygous flowers. What is the phenotypic ratio?
1:2:1
2:2
4
3:1
In cows, coat color is codominant. Cows who have brown coats are BB, and cows who have white coats are WW.
What is the genotype for speckled coats?
BB
BW
WW
AWWW
In cows, coat color is codominant. Cows who have brown coats are BB, and cows who have white coats are WW.
Cross a heterozygous with a brown coat cow. What is the genotypic ratio?
1:2:1
2:2
3:1
4
In cows, coat color is codominant. Cows who have brown coats are BB, and cows who have white coats are WW.
Cross a heterozygous with a brown coat cow. What is the phenotypic ratio?
1:2:1
2:2
3:1
4
A mother is unsure of the father of her child. The mother's blood type is heterozygous A and the baby's is AB.
Man 1's blood type is OO, Man 2's blood type is AA, Man 3's blood type is BO and Man 4's blood type is AB.
Who is the father? Or is there more than one possibility?
Man 1
Man 2
Man 3
Man 4
Man 3 & 4
Heterozyous blood type A is which of the following genotype?
AA
AO
Homozygous blood type A is which of the following genotype?
AA
AO
Homozygous blood type B is which of the following genotype?
BB
BO
Heterozygous blood type B is which of the following genotype?
BB
BO
Cross a heterozygous blood type A with a heterozygous blood type B parent.
What is the genotypic ratio?
1:1:1:1
1:2:1
4
3:1
Cross a heterozygous blood type A with a heterozygous blood type B parent.
What is the phenotypic ratio?
1:1:1:1
1:2:1
4
3:1
Colorblindness is X linked. What do we call females with one copy of the affected chromosome and one copy of the normal chromosome?
normal
carrier
affected
Can males be carriers in X-linked traits?
yes
no
Can males be carriers in traits that are NOT X-LINKED?
yes
no
Colorblindness is X-linked. Cross a carrier female with a affected male.
What is the number of affected males?
0
1
2
Colorblindness is X-linked. Cross a carrier female with a affected male.
What is the number of normal males?
0
1
2
Colorblindness is X-linked. Cross a carrier female with a affected male.
What is the number of affected females?
0
1
2
Colorblindness is X-linked. Cross a carrier female with a affected male.
What is the number of normal females?
0
1
2
Colorblindness is X-linked. Cross a carrier female with a affected male.
What is the number of carrier females?
0
1
2
What are the sex chromosomes for a female?
XX
XY
XXX
XO
What are the sex chromosomes for a male?
XX
XY
XXX
XO
What is the genotype for the grandchild (III - I)?
AA
Aa
aa
What is the genotype for the male in (II-2)?
AA
Aa
aa
What is the genotype for the grandmother (I-2)?
AA
Aa
aa
AA/Aa
AA/aa
What does a square represent?
female
male
What does a circle represent?
female
male
What does a shaded in circle or square represent?
affected
normal
What does a non - shaded in circle or square represent?
affected
normal
carrier
normal/carrier
carrier/affected
In garden peas, tall (T) vine is dominant over short (t) vines. Yellow (YY) seed color is dominant over green (GG) seed color, and the heterozygous seed color is speckled yellow & green (YG).
Cross a heterozygous tall, Heterozygous color seeded plant with a heterozygous tall, Heterozygous color seeded plant.
How many phenotype possibilities are there?
4
6
8
In garden peas, tall (T) vine is dominant over short (t) vines. Seed color is codominant Yellow (YY) seed color is codominant with green (GG) seed color, and the heterozygous seed color is speckled yellow & green (GY).
Cross a heterozygous tall, Heterozygous color seeded plant with a heterozygous tall, Heterozygous color seeded plant.
What is the phenotypic ratio?
12:4
2:2:2:2:4:4
3:6:3:1:2:1
16
4:2:2:4:2:2
