8.1 Extensions of Mendelian Genetics

Question 1

Incomplete Dominance

Answer 1

When a heterozygote expresses a phenotype intermediate between both alleles

Question 2

What is an example of Incomplete Dominance?

Answer 2

RR produces red flowers, Rr produces pink flowers, and rr produces white flowers

Question 3

Codominance

Answer 3

When two alleles are expressed at the same time

Question 4

What is an example of Co Dominance?

Answer 4

ABO blood type is an example because both A and B are being expressed in a type AB person

Question 5

Multiple allelism

Answer 5

Occurs when there are more than two alleles of a gene

Question 6

What is an example of Multiple Allelism?

Answer 6

ABO blood type

Question 7

ABO (a blood group that has three alleles of one gene)

Answer 7

I A and IB are codominant to each other; i is Recessive to both other alleles
And individual will have 2 of these alleles

Question 8

Rh Factor

Answer 8

A blood type

Question 9

Rh+ is caused by

Answer 9

A dominant allele

Also includes Rh+Rh+ and Rh+Rh-

Question 10

Rh- is caused by

Answer 10

2 Recessive alleles

Also includes Rh-Rh-

Question 11

Blood Typing

Answer 11

Used to exclude potential parents

Ex: an AB parent can have an O child and two Rh- parents can never have a Rh+ child

Question 12

Pleitoropy

Answer 12

The ability of a single gene to cause multiple effects on the individuals phenotype

Question 13

Hemophilia

Answer 13

A Pleiotropy that creates the inability to clot blood normally due to the absence of a clotting factor

Question 14

What is the gene for the clotting factor in Hemophilia?

Answer 14

X