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Mendel's Laws of Inheritance: Independent Assortment and Segregation, Slides of Law

Law

A lesson plan for teaching Mendel's Laws of Inheritance, specifically focusing on the concepts of Independent Assortment and Segregation. Students are asked to analyze the genotypes and phenotypes of different individuals and use Punnett squares to predict the outcomes of breeding. Topics covered include the Law of Segregation, dominant and recessive alleles, and the use of Punnett squares to predict the genotypes of offspring.

Typology: Slides

2021/2022

Uploaded on 09/27/2022

christina
christina 🇺🇸

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Objec&ves:*
• Today*we*will…*
– Notes:*Independent*assortment*
– Inquiry:*Should*this*dog*be*called*spot?*
Tomorrow*we*will…*
– Inquiry:**Guinea*pig*gene&cs*
– Notes:*Law*of*Independent*Assortment*
– Prac&ce:*Spongebob*gene&cs*
• So*that*we*can…*
– Use*the*law*of*independent*assortment*to*build*PunneG*
squares*for*2*traits.*
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Partial preview of the text

Download Mendel's Laws of Inheritance: Independent Assortment and Segregation and more Slides Law in PDF only on Docsity!

Objec&ves:

  • Today we will…
    • Notes: Independent assortment
    • Inquiry: Should this dog be called spot? Tomorrow we will…
    • Inquiry: Guinea pig gene&cs
    • Notes: Law of Independent Assortment
    • Prac&ce: Spongebob gene&cs
  • So that we can…
    • Use the law of independent assortment to build PunneG squares for 2 traits.

Bell Work:

Mendel’s early inves3ga3ons had two phases. First, he bred two purebred individuals together to obtain an “F1” genera3on. Then, he bred the offspring of that cross with each other to obtain an “F2” genera3on. Please fill in this diagram with the genotypes of each individual in his inves3ga3on.

Review: Mendel’s Conclusion #2:

Some alleles are “ dominant .” They are

expressed over other “ recessive ” alleles.

Mendel’s Conclusion #3:

Law of Segrega&on

• When each parent

passes only 1 of their

2 alleles to their

offspring, the allele

that is passed is

chosen at random!

Mom Dad

Debrief: Should this Dog

be Called Spot?

  1. Are you able to predict what phenotype your puppy will have for ALL 4 fur traits? Why or why not?
  2. Are you able to describe what phenotype the puppy’s parents would have for ALL 4 fur traits? Why or why not?

Make a connec&on:

All 7 of the pea plant traits that Mendel studied showed independent assortment. What does that tell us about which chromosomes these genes were found on?

Closing:

How does the Law of Segrega&on help to explain why siblings look different from each other, even though they have the same 2 parents? Please write at least 2- sentences. Mom Dad

Homework:

  • Please try the challenge problem on the back of the PunneG square notes!

Bell Work:

Take out the “Should this dog be called Spot?” Please answer these ques3ons on the TOP of that sheet, next to the picture of the chromosomes J

  1. Did your dog have a spoGed or solid coat?
  2. Did she have curly or straight hair?
  3. Your dog grows up & has a puppy of her own! That puppy has solid hair. Which of your dog’s chromosome #5’s did she pass to her puppy? How do you know?
  4. Will the new puppy be more likely to have curly or straight hair? How do you know?

Mendel’s Next Inves&ga&on:

Mendel crosses 2 pea plants that are heterozygous for seed shape and color. What frac3on of the offspring will have wrinkled, green seeds? DOMINANT RECESSIVE (P) (A) (S) (R) (I) (G) (T)

Mendel’s Law of

Independent Assortment:

  • Genes controlling different traits are inherited independently from each other.
  • Ex: The color of a seed does not affect its texture (round or wrinkled).

Prac&ce – Sponge Bob Gene&cs:

Please work with

your partner to

complete these

problems.

Support your

answers with

PunneG squares!

Closing:

  • The laws of segrega&on & independent assortment help to explain why there is MORE/LESS variety in each genera&on of offspring. Explain.
  • Challenge: Do these laws apply to organisms that do NOT reproduce sexually? Why or why now?