Transcript PowerPoint® slides

Breeding Corn
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the classroom, modified slides may not be published in printed or electronic form, including posting on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 4: Breeding Corn
Corn Reproductive Structures
Activity 4: Breeding Corn
Introduction
Read the introduction.


Sexual reproduction is reproduction in
which two parents contribute genetic
material to the offspring.
Selective breeding is the process by
which organisms with desirable traits are
mated with the goal of producing even
more desirable offspring.
Activity 4: Breeding Corn
Challenge

How can information about the
genetic makeup of plants help
farmers breed plants for
desirable traits?
Activity 4: Breeding Corn
Breeding Corn: First Generation
Activity 4: Breeding Corn
Procedure
Basic Genetics


An organism has two copies of the gene
for each of its traits. These copies are
called alleles.
A dominant trait will mask another
version of a trait. A recessive trait will be
hidden by a dominant trait.
Activity 4: Breeding Corn
Procedure
Creating a Punnett Square
Activity 4: Breeding Corn
Which describes the cross that
produced ear A? Ear B?
Punnett Square X
Activity 4: Breeding Corn
Punnett Square Y
Punnett Square Z
Procedure
Breeding Corn: Second Generation
Activity 4: Breeding Corn
Follow Up
Analysis 1

How does a Punnett square show the
possible results of a cross between two
individuals?
Activity 4: Breeding Corn
Follow Up
Analysis 3

What do you predict will happen if a
purple corn plant with the genes Pp is
bred with a corn plant with purple kernels
and the genes PP? Explain your answer,
and include a matching Punnett Square.
Activity 4: Breeding Corn
Follow Up
Analysis 4

How could scientists use selective
breeding to help solve a sustainability
challenge such as breeding a crop that
can survive drought?
Activity 4: Breeding Corn
Revisit the
Challenge

How can information about the
genetic makeup of plants help
farmers breed plants for
desirable traits?
Activity 4: Breeding Corn
Key
Vocabulary







allele
dominant
Punnett square
recessive
selective breeding
sexual reproduction
trait
Activity 4: Breeding Corn