B6- X And Y Chromosomes

Question 1

How many pairs of chromosomes are in the average human body?

Answer 1

23 pairs

Question 2

What are the two chromosomes that determine sex?

Answer 2

X and Y chromosomes

Question 3

What is the chromosome combination for males?

Answer 3

XY

Question 4

What is the chromosome combination for females?

Answer 4

XX

Question 5

What characteristic does the Y chromosome cause?

Answer 5

Male characteristics

Question 6

What characteristic does the XX combination allow to develop?

Answer 6

Female characteristics

Question 7

During sperm production, what is the probability of a sperm cell getting an X or Y chromosome?

Answer 7

50% chance for each

Question 8

What type of genetic diagram is used to show possible genetic outcomes?

Answer 8

Punnett square

Question 9

In a Punnett square, where do you place the possible gametes from one parent?

Answer 9

Down the side

Question 10

In a Punnett square, where do you place the possible gametes from the other parent?

Answer 10

Along the top

Question 11

What do the letters in the middle squares of a Punnett square represent?

Answer 11

Possible combinations of gametes

Question 12

What is the probability ratio of having a boy or a girl?

Answer 12

50:50

Question 13

True or False: The 50:50 ratio of having a boy or girl applies to every pregnancy.

Answer 13

False

Question 14

What do criss-cross lines in a more complicated genetic diagram show?

Answer 14

Possible ways the X and Y chromosomes could combine

Question 15

What is the outcome of combining one gamete from the female and one from the male during fertilization?

Answer 15

Combination of X and Y chromosomes

Question 16

Fill in the blank: The original cell for egg production has __________ X-chromosomes.

Answer 16

two