Warm Up- p. 83mwrightsclassroom.weebly.com/uploads/2/1/7/9/... · Warm Up- p. 83 • What is a mutation? Types? ... • Almost all domesticated animals and most crop plants are the

Warm Up- p. 83 •  What is a mutation? Types? •  What is the process called by

removing a gene in one organism and placing it in another?

•  Dolly the sheep was a clone. What is cloning?

Agenda •  Selective Breeding Notes •  Work on Assignments •  Study Guide

Selective Breeding •  Selective breeding is the method of

artificially selecting and breeding only organisms with a desired trait.

•  Almost all domesticated animals and most crop plants are the result of selective breeding.

How Selective Breeding Works…

•  In order for the parents to show strong expression for the trait, they must carry at least one gene for that trait.

1.  Once the breeder has successfully produced offspring with the desired trait, inbreeding (crossing individuals who are closely related) continues.

2.  Over several generations, the gene for the trait will become more and more prevalent in the offspring.

Drawbacks of Selective Breeding

•  The drawback to selective breeding is that recessive gene defects often show up more frequently.

Selective Breeding Issues in Dogs...

Hyb

ridi

zati

on:

a ty

pe o

f se

lect

ive

bree

ding

•  Hybridization is the breeding of organisms that show strong expression for two different traits in order to produce offspring that express both traits.

•  Often occurs between two different (but similar) species.

•  The offspring are often hardier than either of the parents. –  Ex: horse + donkey = mule zebra + donkey = zedonk lion + tiger = liger