Genotype phenotype purebred breeding and crossbreeding
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Genotype, Phenotype, Purebred Breeding, and Crossbreeding. Objectives. Define genotype and phenotype and know the differences with 100% accuracy. Define purebred breeding and crossbreeding and know the differences with 100% accuracy.

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Genotype, Phenotype, Purebred Breeding, and Crossbreeding

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Genotype, Phenotype, Purebred Breeding, and Crossbreeding


Objectives

  • Define genotype and phenotype and know the differences with 100% accuracy.

  • Define purebred breeding and crossbreeding and know the differences with 100% accuracy.

  • Identify examples of genotype and phenotype in animals with 80% accuracy.

  • Identify purebred and crossbred animals with 80% accuracy.


Key Terms

  • Genotype: Genetic makeup of an animal.

  • Phenotype: The outward expression of a gene.

  • Purebred Breeding: The breeding of animals within the same breed.

  • Crossbreeding: The breeding of two different pure breeds.

  • Codominance: a cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together. 

  • Incomplete dominance: a cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. 


Why?

  • Why should we know the difference between genotype and phenotype?

  • Why should we know the difference between purebred and crossbred animals?

  • Why should we know how to identify animals that are purebred or crossbred?


What?

  • What is the difference between genotype and phenotype?

  • What is the difference between purebred and crossbred?

  • What are examples of animals that are purebred and crossbred?


What is the difference between genotype and phenotype?

  • Genotype: Genetic makeup of an animal.

    • Genotype is in the gene. It is something that we cannot directly see.

  • Phenotype: The outward expression of a gene.

    • Phenotype is the characteristic of the animal that we can see. Ex, Holsteins are black and white.


What is the difference between purebred and crossbred?

  • Purebred Breeding: The breeding of animals within the same breed.

    • Ex, Angus breeds with Angus not with Red Angus

  • Crossbreeding: The breeding of two different pure breeds.

    • Ex, Angus can breed with Red Angus


What are examples of animals that are purebred and crossbred?

  • What are examples of animals that are purebred and crossbred?

    • Animals are considered pure bred when they meet all the characteristics of the breed.

    • Owners of the animal will be able to track the lineage of the animal to ensure heritage.

    • Many ranches will have a purebred stud.

      • This can bring in a lot of money due to other owners wanting their females to breed with a purebred.


Codominance

A cross between organisms with two different phenotypes produces offspring with a third phenotype in which both of the parental traits appear together. 

redxwhite--->RED & WHITE SPOTTED

R = allele for red flowers

W = allele for white flowers

red x white ---> red & white spotted

RR x WW ---> 100% RW


Incomplete dominance

A cross between organisms with two different phenotypes produces offspring with a third phenotype that is a blending of the parental traits. 

RED Flower x WHITE Flower ---> PINKFlower

R = allele for red flowers

W = allele for white flowers

red x white ---> pink

RR x WW ---> 100% RW


Project

  • Create a new breed of animal.

  • Crossbreed two breeds of animals to get desired traits.

  • Needs to show multiple characteristics and have a punnett square for each one.

    • EX). Body type, hair/fur color, body size, ect.

    • Must use at least one codominant or incomplete dominant trait.

  • Draw an example of your creation.

  • Name your creation.

  • Present to the class what you made and how.


Review

  • What is the difference between genotype and phenotype?

  • What is the difference between purebred and crossbred?

  • What are examples of animals that are purebred and crossbred?


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