Download Human Genetics Class Survey Data Sheet

Human Genetic Variations Class Survey
Name________________________
Date:_____________
Period:_____
Standards:

BI2. g. Students know how to predict possible combinations of alleles in a zygote from
the genetic makeup of the parents.
 BI3. a. Students know how to predict the probable outcome of phenotypes in a genetic
cross from the genotypes of the parents and mode of inheritance (autosomal or X-linked,
dominant or recessive).
 BI3. b. Students know the genetic basis for Mendel’s laws of segregation and
independent assortment.
Objectives:
SWBAT…
 Explain the genetic factors that influence the way we look.
 Recognize that DNA contains the genetic information that determines the way we look.
 Explain and describe how genetic information is passed from parents to offspring.
 Predict the physical characteristics of an organism based on its genetic make up.
Part I. Data Collection
Directions:
 Use the information the pictures on the Human Phenotypes Sheet
http://learn.genetics.utah.edu/content/begin/traits/activities/pdfs/Inherited%20Hu
man%20Traits%20Quick%20Reference_Public.pdf to fill in the table below.
 Determine if you have dominant or recessive traits. If you have a dominant trait
write the dominant allele (capital letter) in the genotype/phenotype column. If
you have a recessive trait write two recessive alleles (lowercase letter) in the
genotype column.
 Record the corresponding phenotype to your genotype in the genotype/phenotype
column.
 After filling in the table below record your data on the classroom board.
.
Trait
Gene
Phenotypes
Your
Class
Class
Symbol
Genotype/Phenotype Total
Total
w/
w/
Dominant Recessive
Phenotype Phenotype
Tongue
R / rr
Tongue
rolling
roller/Unable
to roll tongue
Widow’s
W / ww
Widows’ peak
peak
present/
Widow’s peak
absent
Earlobes
E / ee
Unattached
earlobe /
Attached
earlobe
PTC
T/ tt
Thumb
H / hh
Little
Finger
F/ ff
Finger hair
M / mm
Dimples
D / dd
Big toe
(hallux)
Index
finger
Ha/ haha
S/ ss
Bitter taste/
No taste
Straight
thumb/
Hitchhiker’s
thumb
Bent little
finger/
Straight little
finger
Mid-digital
hair present /
Absence of
mid-digital
hair
Dimples
Present /
Absence of
dimples
Short hallux/
Long hallux
Short index
finger / Long
index finger
Part II. Analyzing the Data
Graph Creation:
Create a bar graph or other appropriate chart using Microsoft Word or Excel that displays
your data you collected (class total with the dominant/recessive phenotypes).
1.) To create a graph select the “Insert” tab, and select “Chart”.
2.) Complete your graph by filling in the data table. Make sure to include the following
on your graph: title, labeled axes, a key/legend, and different colors to represent the
data.
3.) Using the data above locate an individual in the class that has all of the same traits as
you. If you cannot find any individual who has all of the same traits then find a
classmate that has two or more of the same traits as you. List the common traits below
and individual’s name.
4.) Identify any observable phenotype ratios.
5.) Which trait had the highest percentage of occurrence in the class?
6.) Which trait had the lowest percentage of occurrence in the class?
Follow-up Questions:
 Answer the questions below in complete sentences.
 You may use the resources listed below to help with this.
Resources:
 http://biology.clc.uc.edu/courses/bio105/geneprob.htm
 http://www.youtube.com/watch?v=prkHKjfUmMs
 http://www.phschool.com/atschool/phbio/active_art/punnett_squares/
 http://learn.genetics.utah.edu/content/begin/traits/activities/pdfs/Inherited%20Hu
man%20Traits%20Quick%20Reference_Public.pdf
Questions:
1.) If a couple without widow’s peaks had children, is there any chance that their
children will have widow’s peaks? Why?
2.) Do you think there is a benefit to being able to taste PTC (phenylthiocarbonate)?
3.) Can you think of any other common traits that we did not observe today?
4.) Create a Punnett Square showing the cross between you and your partner for one
trait (widow’s peak, dimples, earlobes, etc.). Make sure to list the probability of
the genotypes and phenotypes.