WorksheetsPunnett Square
Total questions: 25
Worksheet time: 6hrs 15mins
Which of these characteristics would not be passed on to its offspring?
fur color
length of tail
scars on leg
body size
Which of the following genotypes are Purebred/True-breeding? Select 2 answers.
aA
Aa
AA
aa
Which of the following genotypes is homozygous dominant?
Yy
yY
yy
YY
Which of the following genotypes is homozygous recessive?
Tt
tt
TT
tT
B = brown eyes
b = blue eyes
One brother has genotype BB and the other brother has genotype Bb.
Which statement is true about these two brothers?
They have same phenotype and genotype
They have different phenotypes and genotypes
They have same phenotype, but different genotypes
They have different phenotypes, but the same genotype
T - tall and t = short
In the punnett square below, what belongs in the missing square
tt
Tt
Bb
TT
What is the genotypic ratio of the offspring?
3:1
1:3
1:2:1
2:2
What are the phenotype percentages of the offspring?
(A-Brown fur color; a-white fur color)
50 % Brown fur and 50% White fur
25 % Brown fur and 75% White fur
75 % Brown fur and 25% White fur
0% Brown fur and 100% White fur
If one parent is heterozygous (Aa) and the other is homozygous recessive (aa) for a trait, what percentage of their offspring is expected to be heterozygous?
25%
50%
75%
100%
phenotype examples
green round, yellow wrinkled
genotype examples
GgRr, GGRr, ggrr
phenotype definition
physical or "expressed" traits
genotype definition
allele (letter) combinations
If T is dominant for curved thumbs and t is recessive for straight thumbs, match the phenotype to the correct genotype
Curved
Tt
Straight
tt
Curved
TT
Examples of phenotypes (a) (b) (c) (d) (e)
In guinea pigs, short hair, S, is dominant to long hair, s. Complete the following Punnett squares according to the directions given. Then, fill in the blanks beside each Punnett square with the correct numbers.
A) Father guinea pig is Ss and mother is ss. Expected percentage of offspring: ____ Short hair (SS or Ss) ____ Long hair (ss)
Fruit flies were crossed to observe eye color trait.
R= red eyes
r= brown eyes
Match the number of offspring to their closest phenotypic percentages.
220 Red Eyes
200 Brown Eyes
50% red eye
50% brown eye
368 Red Eyes
92 Brown Eyes
75% Red Eyes
25% Brown Eyes
428 Red Eyes
1 Brown Eyes
100% Red Eyes
0% Brown Eyes
Select the boxes in the Punnett Square where you would find heterozygous offspring.
According to this Punnett square (a) Of the offspring will be homozygous dominant, (b) Of the offspring will be heterozygous, and the remaining 25% will homozygous (c) . As for the phenotypes, (d) Of the flowers will be (e) .
Having a Widow's Peak is dominant (W) over not (w). If parent A (WW) and parent B (ww) have a child, what is the likelihood that--
The child will have a widow's peak
100%
The child will not have a widow's peak
0%
The genotype of these children
Ww
In a monohybrid cross between two heterozygous individuals (Aa), what is the expected phenotypic ratio of the offspring?
1:1
1:2:1
3:1
2:2
Which of the following is an example of a homozygous genotype?
aA
Aa
aa
AB
If a trait is controlled by a single gene with two alleles, one dominant (A) and one recessive (a), what is the probability of an offspring being homozygous recessive if both parents are heterozygous?
25%
50%
75%
100%
Complete the punnett square
T T
t t
