25-10-2023 3VL: Monohybrid crossing

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Monohybrid crossing

Class rules

1. When i am explaining something, you listen;
2. Questions? Raise your hand;
3. Phones are in your bag;
4. At the end of the class i will tell you when to pack,
don't start when i'm still talking;
5. At the end of the class, make sure your chair is pushed back under your desk. 

Today

1. Working with monohybrid Punnett squares
3. Practicing

Learning goals:
1. Learn about monohybrid crossing
2. Be able to perform a monohybrid crossing with a punnett square

What do you remember?

Gene, allele, dominant, recessive, genotype, phenotype, homozygous, heterozygous

Gene

The part of a chromosome that determines a trait, like eye colour

Allele

Different forms of the same gene. Like brown, green and blue eye colour.

Dominant

The allele that is expressed

Recessive

The allele that is not expressed, only when two of these are paired, are they expressed

Genotype

Your inherited genetic characteristics. 

Phenotype

How your inhereted characteristics are represented. So eye colour, hight, blood type and more. 

Homozygous

Two of the same alleles. 

Heterozygous

Two different alleles.

Monohybrid crossing

Let's practice

In mussels, brown coloring (B) is dominant, and blue coloring (b) is recessive. 

A homozygous brown mussel crosses with a blue mussel.

What percentage of offspring are expected to be brown?
0%, 25%, 50%, 75% or 100%?

One more

Assignment

1. Practice the monohybrid crossing with a punnett square

Websites to practice with:
Youtube - Amoeba Sisters:  Monohybrids and the Punnett Square Guinea Pigs
Khan Academy - Monohybrid punnett squares (practice)
Assignment 23, 24, 25, 26 and 27, 28 and 29 of your workbook

Done? Make your summary of paragraph 5.4

Discussion about the questions allowed.

Need help?

Ask the teachter

What did we learn today?

Learning goals:

1. You are now able to perform a monohybrid crossing with a punnett square

Homework

1. Practice with the punnett square

2. If you already find this very easy and you want to practice something harder for fun, you can practice with Dihybrid punnett squares. Look online for an assignment.

Dont forget to push your chair back under your desk!