quiz 14-1

Question 1

the sex chromosomes found in a normal human female

Answer 1

XX

Question 2

number of pairs in a normal human karyotype

Answer 2

23

Question 3

what is a karyotype used for

Answer 3

to see if a person has or will have a genetic disorder

Question 4

which numbered pair of chromosomes is the sex chromosomes

Answer 4

23rd

Question 5

what is an autosome

Answer 5

any chromosome that is not a sex chromosome

Question 6

how many pairs of autosomes does a human have

Answer 6

22

Question 7

in a pedigree, what symbols represent male and what represents female

Answer 7

square = male 
circle = female

Question 8

how does a pedigree show that a human has an individual trait

Answer 8

it shows their genotypes and their parents genotypes

Question 9

4 possible human blood types

Answer 9

A, B, AB, and O

Question 10

disorder caused by a recessive allele

Answer 10

cystic fibrosis

Question 11

what is sickle cell disease caused by

Answer 11

a defective allele for beta-globin

Question 12

what is it called when a gene is on the X chromosome

Answer 12

X-linked genes

Question 13

what sex chromosomes are in a human male

Answer 13

XY

Question 14

what is nondisjunction

Answer 14

?

Question 15

disorder caused by nondisjunction

Answer 15

down syndrome