Topic 3 - Sex Of Offspring

Question 1

How many pairs of chromosomes do human body cells have?

Answer 1

23 pairs of chromosomes

Question 2

What do the first 22 pairs of chromosomes control?

Answer 2

Characteristics

Question 3

What is unique about the 23rd pair of chromosomes?

Answer 3

Carries sex determining genes

Question 4

What are the two types of chromosomes in the 23rd pair?

Answer 4

X chromosomes and Y chromosomes

Question 5

How do the X and Y chromosomes differ?

Answer 5

Y chromosomes are much smaller than X chromosomes

Question 6

What happens during meiosis regarding sex chromosomes?

Answer 6

One sex chromosome goes into each gamete

Question 7

What type of chromosomes do females pass on in their eggs?

Answer 7

X chromosomes

Question 8

What types of chromosomes can males pass on in their sperm?

Answer 8

X or Y chromosomes

Question 9

What tool can be used to show sex inheritance?

Answer 9

Punnett squares

Question 10

What is the probability of a child being male according to the Punnett square?

Answer 10

50% chance

Question 11

What is the probability of a child being female according to the Punnett square?

Answer 11

50% chance

Question 12

Fill in the blank: Females have two _______ chromosomes.

Answer 12

X

Question 13

Fill in the blank: Males have one X chromosome and one _______ chromosome.

Answer 13

Y