WorksheetsPunnett Squares and Genetics
Total questions: 20
Worksheet time: 38mins
Which of the following are GENOTYPES? (select all correct answers)
black hair
homozygous dominant
heterozygous
blue eyes
BB
Which of the following are PHENOTYPES?
green skin
Aa
homozygous recessive
purple eyes
black fur
If A = red fur and a = white fur, what color fur would Aa be? (Assume Mendelian inheritance)
red
white
purple
blue
If A = red fur and a = white fur, what are the PHENOTYPIC ratios of the offspring based on the Punnett Square?
25% heterozygous
50% purple
75% red fur and 25% white fur
25% homozygous recessive, 50% heterozygous, 25% homozygous dominant
If A = green pods and a = yellow pods, what are the PHENOTYPIC RATIOS of the offspring of a cross between two homozygous recessive parents? (Hint: Make a Punnet Square)
100% green pods
100% yellow pods
100% heterozygous
100% homozygous dominant
In plants, tall (T) is dominant to short (t).
Draw a punnett square and perform the following cross: Tt x Tt
What is the probability of producing a short plant?
0%
25%
50%
75%
Phenotype determines genotype
True
False
What are the possible genotypes for this cross? And what percentage of each is produced?
TT = 25% Tt= 50% tt=25%
all tall
TT= 75% tt = 25%
Tt = 100%
How many alleles does an individual normally have for each trait?
1
2
3
4
Who was the Austrian monk that experimented on pea plants and is called the "father of genetics"?
Gregor Mendel
Charles Darwin
Francis Crick
James Watson
The only way for a recessive trait to appear is for an organism to have
two dominant alleles
two recessive alleles
one dominant allele and one recessive allele
Based on this Punnett Square, which answer correctly describes the offspring?
3/4 are tall and purple
All are tall and purple
3/4 are short and white
All are short and white
Each one of the boxes on the Punnett square represents what probability of an offspring's genotype?
25%
1%
10%
0%
What is a GENOTYPE?
the genetic make-up of an organism
the physical trait of an organism
mitosis
meiosis
PHENOTYPE is
the genetic make-up of an organism
the physical trait of an organism
nucleic acid
Aa
The prefix "homo" means
different
same
tomorrow
never
The prefix "hetero" means
different
ugly
fancy
same
