WorksheetsPedigrees
Total questions: 25
Worksheet time: 29mins
How many alleles does a person carry for a trait?
1
2
3
4
How many alleles does a child get from each parent for a trait?
1
2
3
4
Dominant alleles are represented by a ---
capital letter.
lowercase letter.
Aa, DD, Bb, yy are all examples of ---
genotypes.
phenotypes.
In a heterozygous genotype, the _____ allele takes over in the phenotype.
recessive
dominant
both
What you see, or the physical appearance of an organism, is called the ---
genotype.
phenotype.
In a pedigree, which shape represents a male?
circle
square
Which gender has an X and a Y chromosome?
male
female
On a pedigree, this symbol represents a ---
not affected female.
not affected male.
affected male.
affected female.
On a pedigree, this symbol represents a ----
not affected male.
not affected female.
affected male.
affected female.
How many individuals are there in the 3rd generation?
1
2
4
6
How are individuals III-2 and II-4 related?
Brother and sister
Dad and daughter
Uncle and niece
Grandfather and granddaughter
What is the mode of inheritance shown here?
Recessive because it "skips" a generation
Dominant because it shows up in every generation
In the second generation of this pedigree, how many people are carriers of the trait? *Remember: a carrier does not have the disorder/disease, but can pass it on to his/her children.
1
2
3
5
On this pedigree, the allele for curly hair is dominant. The couple labeled 2 both have curly hair, but have a daughter who does not have curly hair. Therefore, we can tell from the chart that for the couple labeled 2 -
the male is heterozygous and the female is heterozygous.
the male is homozygous recessive and the female is homozygous dominant.
The trait this pedigree traces is recessive because it skips a generation and individuals can be carriers. What is the most likely genotype for person III-3?
GG
Gg
gg
Which individual in the first generation is a carrier?
I-1
I-2
If this pedigree shows a recessive disorder, what MUST the genotype of individual II-3 be?
HH
Hh
hh
What is the mode of inheritance shown here?
Recessive because it "skips" a generation
Dominant because it shows up in every generation
Which pedigree is showing a RECESSIVE inheritance pattern?
The genotype aa creates the phenotype that is
dominant
recessive
