Inheritance

Question 1

How many chromosomes are there in an unfertilised egg?

Answer 1

23

Question 2

How many chromosomes are there in a zygote

Answer 2

46

Question 3

What are different versions of the same gene?

Answer 3

Allele

Question 4

What does homozygous mean?

Answer 4

Individuals that carry 2 copies of the same allele

Question 5

What does Heterozygous mean?

Answer 5

Individuals that carry 2 different alleles

Question 6

Why do different children in the same family have different features?

Answer 6

Every child has a new, unique combination of alleles

Question 7

What is different about the chromosomes a woman has compared to a man?

Answer 7

A woman has 2 X’s

And

A male has an X and a Y

Question 8

What sex chromosomes can an egg cell carry?

Answer 8

XX

Question 9

What sex chromosomes can a sperm cell carry?

Answer 9

XY

Question 10

A reason why people might not want to choose the sex of their children

Answer 10

Ethical reasons

Question 11

Why do people have different opinions on whether couples should be allowed to choose the sex of their child?

Answer 11

A genetic disorder may run in only one sex of the family

Question 12

What do we call an egg cell after it has been fertilised?

Answer 12

Zygote