reading perdigrees ect

Question 1

who has TWO x chromosomes (xx)

Answer 1

female

Question 2

who has one x one y chromosome

Answer 2

male

Question 3

how many chromatids/ chromosomes does an average person have?

Answer 3

23 pairs - 46 chromosomes

Question 4

without the sex chromosomes, how many do we have

Answer 4

22 pairs - 44 chromosomes

Question 5

how many chromosomes does one with down syndrome have?

Answer 5

47 chromosomes

Question 6

whats a centromere?

Answer 6

A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere.

Question 7

what are the parts of a nucleotide?

Answer 7

phosphate
deoxyribose
(A, C, T, G)

Question 8

What does A stand for?

Answer 8

adenine

Question 9

what does C stand for?

Answer 9

cytosine

Question 10

what does T stand for?

Answer 10

Thymine

Question 11

what does G stand for?

Answer 11

Guanine

Question 12

what are the nucleotide pairs?

Answer 12

A - T
C - G

Question 13

mutation?

Answer 13

a change in a DNA sequence (the DNA code is mixed up)

Question 14

what is a double helix?

Answer 14

a term used to describe the physical structure of DNA.