YR3-K16-LSN2

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

ENTRY TICKETS:

• Complete the KWIZL "ET_CH16_LSN2"
• Grade someone else's work.
• Give feedback.
• Reflect on your own work. 

HAVE READY

• JOIN THIS LESSONUP
• YOUR NOTEBOOK
• KERBOODLE PAGE 247
• GOOGLE CLASROOM

PLAN FOR TODAY:

• CHECK IN CLASS ASSIGNMENTS LESSON 1
• HW FOR LESSON 2 (ANY QUESTIONS)
• PRACTICE QUESTIONS
• IN CLASS ASSIGNMENTS LESSON 2

PRACTICE ASSIGNMENTS

INHERITANCE

ASSIGNMENTS DURING LESSON 1

• CHECK THE ANSWERS
• ASK QUESTIONS 

• I know what heterozygous and homozygous genes are and I can explain the difference.
• I know what genotype and phenotype is and I can explain the difference.
• I understand and can explain the difference between dominant & recessive genes.
• I can use a punnet square to show the inheritance of certain genes.

• HETEROZYGOUS
• HOMOZYGOUS
• DOMINANT
• RECESSIVE
• ALLELES
• GENOTYPE
• PHENOTYPE
• PUNNET SQUARES

KERBOODLE P. 246-252

Practice assignments in class: #1

Someone's gender is also genetic, in this case I mean the sex you are born with and not the gender you identify with.

a. What alleles exist in terms of gender? 

b. What are the parents genotypes? and possible gametes?

c. Show the possible crosses in a punnet squares.

d. What possible outcomes are there. 

Gregor Mendel

- pea plants experiments 

- discovered the rules of inheritance 

Alleles

2 alleles code for a characteristic, on neighbouring chromosomes

Alleles = different forms of the same gene

Dominant and recessive alleles

Big letter = Dominant allele (e.g.: B)

Small letter = Recessive allele (e.g.: b)

--> combinations in genotype: BB, bb = homozygous

                                                                  Bb = heterozygous

Genotype: combination of alleles

Phenotype: appearance

Alleles

Heterozygous: different alleles

Homozygous: same alleles

Dominant and recessive alleles

Alleles

Alleles

Steps with Punnet Squares

1. Identify your alleles.
2. Identify genotype parent 1. Show possible gametes.
3. Identify genotype parent 2. Show possible gametes.
4. Fill in your punnet squares.
5. Write down ratios of the possible genotypes.
6. Write down ratios of the possible phenotypes.

Crossing schemes

Crossing examples

R = red flowers

r = white flowers 

-> both parent flowers were homozygous

-> make the crossing scheme 

Crossing examples

Crossing 2 heterozygous red flowers 

-> make the crossing

Practice assignments in class: #2

With Labradors the chocolate colour is dominant and the blond colour is recessive. Work through all the steps you just wrote down to give me a prediction of the offspring of two chocolate labradors that both have heterozygous genes. Work using the letter B.

Practice assignments in class: #2

1. B = chocolate, b = blond
2. Genotype parent 1 = Bb, gametes = "B" & "b"  
3. Genotype parent 1 = Bb, gametes = "B" & "b"

Practice assignments in class: #2

4. 

5.  25% BB, 50% Bb & 25% bb

6. 75% chocolate & 25% blond

	B	b
B	BB	Bb
b	Bb	bb

ASSIGNMENTS FOR LESSON 2:

• START AT THE LEVEL THAT APPLIES TO YOU
• THEY MUST BE COMPLETED BEFORE THE NEXT LESSON
• FIRST 10 MINUTES IN SILENCE, THEN YOU CAN DISCUSS AND ASK QUESTIONS

HOMEWORK FOR LESSON 3:

• STUDY THE WRTS LSN 1-3
• COMPLETE THE HW FOR LESSON 3
• COMPLETE ANY IN CLASS ASSIGNMENTS LEFT FROM THIS LESSON IN YOUR NOTEBOOK
• DOUBLE CHECK YOU UNDERSTAND EVERYTHING