YR3-K16-LSN3

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

HAVE READY

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

CHAPTER 16

INHERITANCE

• 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

CHAPTER 16: POP QUIZ

INHERITANCE

How many chromosomes should be in a human sperm cell? please only fill in a number.

What does the word diploid mean? How many sets of chromosomes are present in your cells? please only fill in a number.

This is a strand of mRNA, what protein is this meant for?

1. skin cells
2. hair cells
3. muscle cells
4. this is not mRNA

This is a photograph of a set of human chromosomes, also known as a karyotype. What can you say about this person.

1. This person is male.
2. This person is female.
3. This person has Down's Syndrom (3x)
4. This is not a human karyotype.

Whether your earlobe is attached to your jawline or not is a characteristic that is determined by a single gene. A detached earlobe is the dominant gene in this case.

A father has a heterozygous genotype for this gene of Aa. What gametes does the father produce in which ratio?

1. 100% of his sperm cells are Aa
2. 50% of his sperm cells are A 50% of his sperm cells are a
3. 75% of his sperm cells are A 25% of his sperm cells are a
4. 100% of his sperm cells are a

The same father with heterozygous earlobe genes decides to have a family, his wife also has heterozygous genes for detached earlobes.

What gametes do both parents produce?

1. Dad: 50% A & 50% A Mum: 50% a & 50% a
2. Dad: 100% Aa Mum: 100% Aa
3. Dad: 50% A & 50% a Mum: 50% A & 50% a
4. Dad: 75% A & 25% a Mum: 75% A & 25% a

Jill is a longhaired cat who had kittens with Jack. Their kittens are both longhaired and shorthaired. The gene for having long hair is a recessive gene.
Tom makes 3 statements about this case:
1) Jill has heterozygous genes for long hair.
2) Jill has homozygous genes for long hair.
3) Jil could have both heterozygous or homozygous genes for long hair.
Which statement is correct?

1. none of the above
2. statement 1
3. statement 2
4. statement 3

Cats have 38 chromosomes in their cells. How many chromosomes should they have in their gametes? please only fill in a number.

PRACTICE ASSIGNMENTS

INHERITANCE

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.

Practice assignments in class: #1

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: #1

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: #1

4. 

5.  25% BB, 50% Bb & 25% bb

6. 75% chocolate & 25% blond

	B	b
B	BB	Bb
b	Bb	bb

Practice assignments in class: #2

Kerboodle page 262 exercises 1-4

HOMEWORK FOR LESSON 4:

• COMPLETE THE HW FOR LESSON 4
• COMPLETE ANY IN CLASS ASSIGNMENTS LEFT FROM THIS LESSON IN YOUR NOTEBOOK
• DOUBLE CHECK YOU UNDERSTAND EVERYTHING
• YOUR NOTES WILL BE CHECKED AT THE DOOR