Human Genetics - Phenotype and Genotype
Exercise 1: Observing Phenotype Characteristics
Data Table 1: Phenotype and Genotype
Trait
Dimpled Chin
Free ear lobe
Ability to taste
PTC strips
Interlocking
fingers
Mid-digital hair
Bent little finger
Phenotype Characteristics
Phenotype &
Genotype from
Parent 1
Phenotype &
Genotype(s)
from Parent 2
Offspring
Human Genetics - Phenotype and Genotype
Window's peak
Hitchhiker's
thumb
Blue or green eyes
Rolled tongue
Human Genetics - Phenotype and Genotype
Punnett Squares
Example: As described in Data Table 1, Parent 1 has the genotype Dd for the dimpled chin gene. If
the recorded genotype for Parent 2 was dd, the Punnett Square would appear as follows. From this,
the phenotypic and genotypic ratios may be deduced.
IMPORTANT: Two blank Punnett squares are provided for each trait. If Parent 2 has a dominant
phenotype, then you will create two Punnett squares; if Parent 2 has a recessive phenotype, then you
will create one Punnett square.
Parent 1
Free Ear
Lobe
Parent 2
Parent 2
Free Ear
Lobe
Dimpled
Chin
Parent 1
Parent 2
Parent 1
Parent 2
Dimpled
Chin
Parent 1
Human Genetics - Phenotype and Genotype
Mid-digital
Hair
Parent 1
Bent Little
Finger
Parent 2
Parent 2
Bent Little
Finger
Interlocking
Fingers
Parent 1
Parent 1
Parent 2
Parent 1
Parent 2
Mid-digital
Hair
Parent 1
Parent 2
Parent 1
Parent 2
Interlocking
Fingers
Ability to
Taste PTC
Strips
Parent 2
Parent 1
Parent 2
Ability to
Taste PTC
Strips
Parent 1
Human Genetics - Phenotype and Genotype
Blue or
Green Eyes
Parent 1
Rolled
Tongue
Parent 2
Parent 2
Rolled
Tongue
Hitchhiker’s
Thumb
Parent 1
Parent 1
Parent 2
Parent 1
Parent 2
Blue or
Green Eyes
Parent 1
Parent 2
Parent 1
Parent 2
Hitchhiker’s
Thumb
Widow’s
Peak
Parent 2
Parent 1
Parent 2
Widow’s
Peak
Parent 1
Human Genetics - Phenotype and Genotype
Exercise 2: Genetic Screening – Phenotype and Genotype
Chromosomes of Disorder 1
Human Genetics - Phenotype and Genotype
Data Table 2: Karyotype for Chromosomal Disorder 1
Karyotype
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
x
Y
Chromosomal Disorder 1:
Human Genetics - Phenotype and Genotype
Chromosomes of Disorder 2
Data Table 3: Karyotype for Chromosomal Disorder 2
Note that there are 2 chromosomes present at X.
Human Genetics - Phenotype and Genotype
Data Table 3: Karyotype for Chromosomal Disorder 2
Karyotype
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
x
Y
Chromosomal Disorder 2:
Human Genetics - Phenotype and Genotype
Data Table 4: Karyotype to Genotype to Phenotype
#
1
2
3
Karyotype Image
Chromosomal
Disorder
Genotype
Phenotype
Human Genetics - Phenotype and Genotype
4
5
6