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Reviewed by: Andrea R (, 0) on 1/13/2022 12:33:38 AM
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The learner will trace the family history of a horse named Junior as they explore why he has the characteristic traits that he does. The lesson includes an interview with a horse breeder and demonstrates how traits are passed from generation to generation. The lesson makes it clear that each parent contributes to the traits of the offspring, demonstrating the Cross Cutting Concepts of "cause and effect".
MS-LS3-2 Develop and use a model to describe why asexual reproduction results in offspring with identical genetic information and sexual reproduction results in offspring with genetic variation.
Clarification Statement: Emphasis is on using models such as Punnett squares, diagrams, and simulations to describe the cause and effect relationship of gene transmission from parent(s) to offspring and resulting genetic variation.
Assessment Boundary: none
This resource appears to be designed to build towards this performance expectation, though the resource developer has not explicitly stated so.
Comments about Including the Performance Expectation
This is part of a larger unit called:
"Where'd You Get Those Genes?" from the California Foundation for Agriculture in the
Classroom. http://www.cfaitc.org/lessonplans/pdf/408.pdf It does an excellent job of
showing how the offspring in sexual reproduction are the results of obtaining genes
from both parents and how this leads to genetic variation.
This resource is explicitly designed to build towards this science and engineering practice.
Comments about Including the Science and Engineering Practice
The model used in this lesson is a Pedigree Chart/Family Tree and provides the students with an excellent visual display of data.
This resource appears to be designed to build towards this disciplinary core idea, though the resource developer has not explicitly stated so.
Comments about Including the Disciplinary Core Idea
The main objective of the activity is that the learner will explore how genetic make-up is received from both parents and is expressed by traits that can be predicted. The background information makes the connection that an offspring is the result of half of the genes acquired from both parents. The educator has to make the connection that with each offspring the random acquisition of genes produces siblings that will not be exactly alike, even though they are from the same parents. Additional teacher background information on horse coat and eye color can be found at http://colorgenetics.info/equine/eye-color-horses.
This resource was not designed to build towards this crosscutting concept, but can be used to build towards it using the suggestions provided below.
Comments about Including the Crosscutting Concept
This lesson should serve as the beginning of a study in the mechanism of gene transfer and variety in the offspring.
To firmly grasp the idea of "cause and effect" the educator needs to discuss how Junior’s parents have two different forms of a trait and so the effect is that Junior receives one of them.