27 Jun BIOS 140 Observing Human Phenotypes Worksheet
Question
Objective:
We will learn to observe inherited phenotypes and predict outcomes based on specific pedigree
charts.
Part I:
Given below are some of the inherited traits. Based on the phenotype, predict the genotype.
You may have to consider more than one possibilities of a genotype for some of the traits. (2
points each)
Notes to Students: If you are doing the lab in the class room, calculate the ratio in the class
room. Online students should ignore the question.
Bent little finger: A bent little finger is dominant over a straight finger. If you hold the two little
fingers next to each other with your palms facing you, the last segment of the bent little fingers
will move away from each other and towards the ring finger.
B= Bent little finger; b= straight finger
Your genotype= ____________________
Ratio in the class room= ______________
Widow’s Peak: The presence of widow’s peak is dominant over straight hair line. A widow’s
peak is a distinct pointed peak in the hairline in the center of the forehead. Straight hair line
makes almost a horizontal straight line across the forehead.
P= Widow’s peak; p= Straight Hair
Your genotype= ____________________
Ratio in the class room= ______________
Dimples: Dimples on the cheeks is dominant over no dimples.
D= dimples; d= No dimples
1Observing Human Phenotypes
Your genotype= ____________________
Ratio in the class room= ______________
Freckles: Presence of freckles is dominant over no or very few freckles.
F= Freckles; f= No freckles
Your genotype= ____________________
Ratio in the class room= ______________
Ear lobes: Free ear lobe is dominant over attached ear lobe.
E= Free ear lobe; e= attached ear lobe
Your genotype= ____________________
Ratio in the class room= ______________
Tongue rolling: The ability to roll tongue into a U-shape is dominant over the lack of this ability.
R= Tongue rolling; r=non-tongue roller
Your genotype= ____________________
Ratio in the class room= ______________
Hair color: Non-red hair is dominant over red hair.
H= non-red hair color; h= red hair
Your genotype= ____________________
Ratio in the class room= ______________
Middigital hair: Middigit is the middle segment of a finger. Hairy middigits are dominant over
hairless middigits.
M= hairy middigits; m= Hairless middigits
Your genotype= ____________________
Ratio in the class room= ______________
Part II:
2Observing Human Phenotypes
Scenario 1: Given below is a pedigree chart of a family showing inheritance of straight eyes
(shaded) or crooked eyes (open). Squares indicate a male and circles indicate a female.
Based on the chart below, fill the blanks below and determine the genotype of all members of
the family. (5 points)
Assumption:
A = _______________
(straight or crooked)
a = _______________
(straight or crooked)
What type of eyes would each genotype have (straight or crooked)?
AA = ____________
Aa = ____________
aa = ____________
Pedigree Chart:
Genotype of Grand children: (Show for both alleles) (1 point)
Is straight eyes inherited as a dominant or recessive trait? (1 point)
Scenario 2: Given below is a pedigree chart of a family showing inheritance of Large ears
(shaded) or small ears (open). Squares indicate a male and circles indicate a female. Based
3Observing Human Phenotypes
on the chart below, answer the questions below and determine the genotype of all members of
the family. (5 points)
Assumption:
A = _______________
(large or small)
a = _______________
(large or small)
What type of ears would each genotype have (large or small)?
AA = ____________
Aa = ____________
aa = ____________
Genotype of Grand children: (Show for both alleles) (1 point)
Are large ears inherited as a dominant or recessive trait? (1 point)
4Observing Human Phenotypes
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