DNA and genetics - Chapter 1

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

Chapter 1: traits

Questions of chapter 1

Today's planning

At the end of the lesson...

• ... you can explain the difference between genotype and phenotype and also give examples of both

• ... you can relate the amount of chromosomes to the type of cell

• ... you can explain the difference between alleles and genes
  

Questions about traits

Your genotype influences your phenotype. But also your environment influences your phenotype. Explain this.

Sometimes, your phenotype is different than what the genotypes shows. Give three examples of phenotypic traits that you cannot find in your genotype.

Walter’s parents are divorced. His mother has a new boyfriend. Did Walter inherit any traits from his mother’s new boyfriend? Why (not)?

Questions about chromosomes and genes

Look at the picture. How many chromosomes can you find in the following cells? Copy the number of the questions and type behind the amount of chromosomes. 1. Cheek cell of a human; 2. Skin cell of a sheep; 3. Egg cell of a pig; 4. Egg cell of a donkey; 5. Sperm cell of a dog; 6. Sperm cell of a buffalo

Horses and donkeys can have children together. How many chromosomes will you find in the skin cell of a hinnie (donkey/horse hybrid)?

Ties is doing research. He is looking at a cell with 39 chromosomes. Explain what type of cells this is (sex cell or body cell) and which organism from the table the cell is.

Is the person in the karyogram a boy or a girl? Explain how you can see this.

How many chromosomes does this person in the karyogram have?

Questions about genes and alleles

What is the difference between an allele and a gene?

Stacey says: “Eye colour is a good example of an allele.”
Max says: “I disagree, eye colour is not an example of an allele but of a gene.”
Explain who is right.

Boys and girls have different genes. On which chromosome do you expect to find the genes that make boys, boys?

Farah is lactose intolerant. Lactose intolerance is a genetic condition. You cannot digest milk and other dairy products. Explain if the gene causing lactose intolerance is present only in the cells of the digestive system or in all the body cells.