Transcript sgi_genetics_8 - POLYTECH High School

Interpreting Pedigrees
LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers
currently teaching the Science and Global Issues SEPUP course to customize the unit to match their
students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the
modifying teacher in his or her classroom, or shared with other teachers of Science and Global Issues
within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of
the classroom or distributed to any non-student person or organization. Except for use with students in
the classroom, modified slides may not be published in printed or electronic form, including posting on
the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified
in any way except to change their size.
DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”)
MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor
for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect
to any claims by the purchaser or user of Science and Global Issues or any third party on account of or
arising from the use or modifications to the slides. Client acknowledges and accepts that University
services are provided on an as-is basis.
Activity 8: Interpreting Pedigrees
Get
Started
Read the introduction.

A pedigree shows generations and
relationships among biological parents
and offspring. It also tracks which of those
individuals have a specific trait.
Activity 8: Interpreting Pedigrees
Challenge

What information can
geneticists obtain by analyzing
a pedigree?
Activity 8: Interpreting Pedigrees
Analyzing Pedigrees
Activity 8: Interpreting Pedigrees
Pedigree A: Huntington’s Disease
Activity 8: Interpreting Pedigrees
Pedigree B: PKU
Activity 8: Interpreting Pedigrees
Pedigree C: Hemophilia
Activity 8: Interpreting Pedigrees
Analysis 2

Examine the pedigree below for grain plants with a
trait for a high amount of protein. What can you
determine about the trait based on the pedigree?
Activity 8: Interpreting Pedigrees
Follow Up
Analysis 3

How do farmers and agricultural
geneticists use the information provided
by a pedigree to breed desirable traits in
an agricultural crop?
Activity 8: Interpreting Pedigrees
Analysis 4

On the next slide is a pedigree for cattle that have
been genetically modified to produce a human
protein that helps prevent blood clots in humans.
Using the information in the pedigree, answer the
following questions:
a. What type of inheritance mechanism—dominant,
recessive, or sex-lined recessive—is shown in the
pedigree? Support your answer with evidence.
b. From the information in the pedigree from generation 3,
can you determine if the gene is still present in the cow
population? Explain why or why not?
Activity 8: Interpreting Pedigrees
Analysis 4, continued
Activity 8: Interpreting Pedigrees
Revisit the
Challenge

What information can
geneticists obtain by analyzing
a pedigree?
Activity 8: Interpreting Pedigrees
Key
Vocabulary







allele
carrier
Dominant
pedigree
recessive
sex-linked
sex-linked recessive
Activity 8: Interpreting Pedigrees