Phenotypes and Genotypesof Human Traits
Widow’s Peak
W=Pointed Hairline
w=Straight Hairline
Bent Little Finger
B=Bent Pinkie
b=Straight Pinkie
Albinism
A=Melanin Produced; pigmented skin, hair, iris
a=No Melanin produced; No pigmentation
Pigmented Iris
P=Pigmented Iris – Green, Hazel, Brown, Black eyecolor
p=Non-pigmented Iris – Blue, Grey eyecolor
Attached Earlobes
E=Free, unattached earlobes
e=Attached earlobes
Hitchhiker’s Thumb
H=Thumb does not bend back
h=Thumb bends back (more than 60 degrees)
Interlacing Fingers
C=Left thumb crosses in front of right
c=Right thumb crosses in front of left
Middigital Hair
M=Middigital Hair
m=No Middigital Hair
Dimpled Chin
M=Dimpled Chin
m=No Dimples
Six Fingers
S=Six Fingers
s=Five Fingers
Widow’s Peak
W=Pointed Hairline
w=Straight Hairline
Bent Little Finger
B=Bent Pinkie
b=Straight Pinkie
Albinism
A=Melanin Produced; pigmented skin, hair, iris
a=No Melanin produced; No pigmentation
Pigmented Iris
P=Pigmented Iris – Green, Hazel, Brown, Black
eyecolor
p=Non-pigmented Iris – Blue, Grey eyecolor
Attached Earlobes
E=Free, unattached earlobes
e=Attached earlobes
Hitchhiker’s Thumb
H=Thumb does not bend back
h=Thumb bends back (more than 60 degrees)
Interlacing Fingers
C=Left thumb crosses in front of right
c=Right thumb crosses in front of left
Middigital Hair
M=Middigital Hair
m=No Middigital Hair
Dimpled Chin
M=Dimpled Chin
m=No Dimples
Six Fingers
S=Six Fingers
s=Five Fingers
Class Phenenotypic Data for Human Traits (Table 17.3)
Characteristic
Widow’s Peak
Bent Little Finger
Albinism
Pigmented Iris
Attached Earlobes
Hitchhiker’s Thumb
Interlacing Fingers
Middigital Hair
Dimpled Chin
Six Fingers
Dominant
Phenotype
8
4
19
18
13
9
11
6
4
0
Recessive
Phenotype
11
15
0
1
6
10
8
13
15
19Formulate a null hypothesis and an alternative hypothesis regarding phenotype type (dominant or
recessive) and frequency(6 pts).
Null:
Alternative:
Table 17.3 from BIO 104 Lab Manual (p 100) (10 pts)
Characteristic
Widow’s
Peak
Bent
Little finger
Albinism
Pigmented
Iris
Attached
Earlobes
Hitchhiker’s
BIO 104
Week 13 – Ex. 17 Genetics
Thumb
Interlacing
Fingers
Middigital
Hair
Dimpled
Chin
Your Phenotype Your Genotype*
Six Fingers
* Homozygous dominant, heterozygous, homozygous recessive
Phenotype Frequencies of Class
Dominant
Recessive1. Examine phenotype frequencies for the class, and describe any patterns (or lack of patterns)
found. In the description, include which (if either) hypothesis was supported, and explain
why. (6 pts)
2. Six fingers is a dominant trait; however, most (usually all) individuals in the class have five
fingers, which is homozygous recessive (ss). Is this surprising? Explain why or why not. (4 pts)
3. Anne has a widow’s peak, a dominant trait. However, she doesn’t know if she is homozygous
dominant (WW) or heterozygous (Ww) for this trait. Anne knows that her mother also has a
widow’s peak, her father has a widow’s peak, and her brother, John, lacks a widow’s peak.
Additionally, Anne is married to Jeff, and they have two children, Paige and Sean. Jeff does NOT
have a widow’s peak. Paige has a widow’s peak, and Sean lacks a widow’s peak. Based on this
information, provide a pedigree of Anne’s family, and determine whether Anne is homozygous
dominant or heterozygous for this trait. (8 pts)
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