Inheritance

Question 1

How many pairs of chromosomes do humans have in their cells?

Answer 1

23

Question 2

Chromosomes are composed of ______.

Answer 2

DNA

Question 3

Different versions of a gene are known as ______.

Answer 3

Alleles

Question 4

What is the expressed characteristics of a gene?

Answer 4

Phenotype

Question 5

Which of the following is a heterozygous genotype?

Aa
AATT
aa
AA

Answer 5

Aa

Question 6

When the alleles for a gene are different, which allele is the one expressed?

Answer 6

Dominant allele

Question 7

Assuming dimples (D) are dominant to no dimples (d) allele, which of the following genotypes would NOT have dimples?

Dd
DD
dd

Answer 7

dd

Question 8

When a disorder needs to be inherited from both parents to be expressed it would be considered ________.

Answer 8

Autosomal recessive

Question 9

True or False? Sex-linked disorders are more likely to affect men

Answer 9

True

Question 10

True or False? Males do not have an X-chromosome

Answer 10

False

Question 11

The genes for blood type demonstrate the following inheritance pattern:

Answer 11

Codominance

Question 12

What is the result of non disjunction during meiosis l?

Answer 12

All resulting cells have abnormal chromosome number

Question 13

What results in trisomy?

Answer 13

The additional of a chromosome

Question 14

Down’s syndrome is an example of which of genetic disorder?

Answer 14

Trisomy