5.2 what are the chances?

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

5. It runs in the family

5.2 What are chances?

today''s program 

Make exercises 5.1 workbook

Go to lessonup and use the lesson 5.2

Make notes in your notebook

Make exercises 5.2

Learning objectives

learning objectives: you can 

- explain the difference between autosomes and sex-chromomes, between somatic cells and sex cells (games 

- explain how the gender of a baby is determined

- describes the diffences between the chromosomes of a sperm cell and an egg cel 

how did you inherit characteristics from your parents?

why do some inherited characteristics not show?

what are chromosomes and what do they contain?

why do siblings look similar to their parents and each other?

cells and chromosomes

humans have: 

somatic cells : 'body cells', 46 chromosomes, 23 pairs of chromosomes, diploid cells 

gametes : 'sex cells' (egg cells, sperm cells), 23 single chromosomes, haploid cells 

cells and chromosomes

humans have in EACH somatic cell: 

• 22 pairs of autosomes
• 1 pair of sex chromosomes : X X = female, XY=male 

so, humans have in EACH gamete:

• 22 autosomes
• 1 sex chromosome

questions...

• How many sex chromosomes are there to be found in a gamete? 
• What are the chances of having a baby girl of baby boy?
• Who is ‘responsible’ for the gender of a baby: the mother, the father or both?

huiswerk

learn par. 5.2

do exercises workbook 5.2

questions...

• How many sex chromosomes are there to be found in a gamete? 
• What are the chances of having a baby girl of baby boy?
• Who is ‘responsible’ for the gender of a baby: the mother, the father or both?