Genetics Section 3

Question 1

there are how many chromosomes in each human cell?

Answer 1

46

Question 2

there are how many chromosome pairs in each human cell?

Answer 2

23

Question 3

there are how many chromosomes in each human sex cell

Answer 3

23

Question 4

___ are located on chromosomes.

Chromosomes are located in the ____.

Answer 4

Genes, nucleus

Question 5

Each cell in the human body has how many genes?

Answer 5

20,000-25,000

Question 6

Each gene controls a ____ or many traits.

Answer 6

trait

Question 7

There may be several _____ for 1 trait.

Answer 7

genes

Question 8

How are genes passed from parent to offspring

Answer 8

sex cells contain half of each parent’s genes.

when the sex cells from each parent join during fertilization the offspring receives a full set of genes.

Question 9

What is the “chromosomal theory of inheritance”?

Answer 9

Genes are carried from parents to their offspring on their chromosomes

Question 10

____ chromosomes carry genes that determine sex.

___ have 2 X chromosomes (xx). Males have 1 ____ chromosome and 1 ___ chromosome.

Answer 10

Sex
Females
x
y

Question 11

how does the order of genes in 1 member of a chromosome pair compare to the order of genes on the other chromosome?

Answer 11

they are lined up in the same order on both chromosomes