Chapter 4- Part 1

Question 1

Heterozygous blood type…

Answer 1

Exhibits both homozygous phenotypes simultaneously (AB)

Question 2

Universal Donor

Answer 2

Type O

Question 3

Universal recipient

Answer 3

type AB

Question 4

Mixing of blood types

Answer 4

leads to clumping because of antigenic reactions

Question 5

Incomplete dominance

Answer 5

heterozygote displays an intermediate phenotype

Question 6

haplosufficient gene

Answer 6

Heterozygous gene produces enough enzyme to display wild type phenotype

Question 7

Essential Gene

Answer 7

Genes that when mutated, can result in a lethal phenotype

Question 8

Lethal allele

Answer 8

allele that results in the death of an organism

Question 9

Example of a dominant lethal allele

Answer 9

Huntington’s disease

Question 10

example of a recessive lethal allele

Answer 10

• hemophilia
• Tay Sachs Disease

Question 11

every generation is affected

Answer 11

means the phenotype is dominant

Question 12

Tay Sachs Disease

Answer 12

inherited disorder that progressively destroys nerve cells in brain and spinal cord

Question 13

Tay Sachs mutations

Answer 13

missense mutations in the HEXA gene make a non-functional protein (Hex-A)

Question 14

Hex-A protein function

Answer 14

helps process essential component of nerve cells (brain ganglioside)