WorksheetsBiology - Unit 7 (Genetics)
Total questions: 20
Worksheet time: 11mins
T = tall and t = short
What genotype belongs in the missing box of the Punnett square?
tt
Tt
Bb
TT
What allele combination should go in the missing box of the Punnett square?
AA
Aa
aa
none of these
A = Brown hair and a = blond hair
What are the phenotype percentages of the offspring?
50% Brown hair and 50% Blond hair
25% Brown hair and 75% Blond hair
75% Brown hair and 25% Blond hair
0% Brown hair and 100% Blond hair
What percent of offspring will have the homozygous recessive genotype?
25%
50%
75%
100%
Which of the following represents a heterozygous genotype?
Tt
BB
ff
Curly
Which of the following represents a homozygous dominant genotype?
Tt
BB
Ff
gg
What are the chances that the offspring will have the homozygous recessive genotype?
1 in 4
4 out of 4
75%
50%
Which of the following is true about both parents in this Punnet square?
Both are homozygous dominant.
Both are homozygous recessive.
Both are heterozygous.
Both have blue eyes.
What are the genotype ratios in the Punnett square?
1/4 blue eyes, 3/4 brown eyes
BB = 1/4, Bb = 2/4, bb = 1/4
BB = 2/4, bb = 2/4
All brown eyes
How many boxes in the Punnet square would have the genotype BB?
1
2
4
0
Based on the information in the Punnett square, what is the dominant trait?
yellow pea seeds
green pea seeds
there is no dominant trait
Jolly green giant
Which genotype(s) would lead to the phenotype of yellow seeds?
aa
Aa
AA
AA or Aa
Brown (B) is dominant to green (b).
What is the probability of these parents having green offspring?
1/4
2/4
3/4
4/4
What genotype percentages would result from the cross shown in the Punnett square?
TT = 25%, Tt= 50%, tt=25%
100% tall
TT= 75%, tt = 25%
Tt = 100%
Incomplete dominance is shown when these two owls mate. A brown owl (BB) crossed with a white owl (WW) produces tan (WB) offspring.
What genotype would go into box 1 of the Punnett square?
WW
WB
BB
Incomplete dominance is shown in dragons. When a yellow dragon (YY) breeds with a red dragon (RR), orange (RY) dragon offspring are produced.
What is the probability of yellow offspring when an orange dragon is crossed with a yellow dragon?
0%
25%
50%
100%
Which of the following represents a homozygous recessive genotype?
Tt
BB
Ff
gg
Incomplete dominance is shown in dragons. When a yellow dragon (YY) breeds with a red dragon (RR), orange (RY) dragon offspring are produced.
What are the phenotypic ratios when two orange dragons are crossed?
2/4 orange, 2/4 yellow
3/4 red, 1/4 orange
1/4 orange, 1/4 yellow, 2/4 red
1/4 red, 2/4 orange, 1/4 yellow
