If the following error is made during DNA replication during mitosis and is not
ID: 167358 • Letter: I
Question
If the following error is made during DNA replication during mitosis and is not corrected by proofreading enzymes prior to cytokinesis, what proportion of the descendants of this cell will carry the mutation?
Select one:
a. 100%
b. 75%
c. 50%
d. 25%
A mother with type A blood and a father with type B blood have four children with the following blood types:
child 1: type A
child 2: type AB
child 3: type O
child 4: type AB
Based on the phenotypes of their offspring, what are the genotypes of the parents?
Select one:
a. Mom: AO, Dad: BO
b. Mom: AA, Dad: BB
c. Mom: AB, Dad: BO
d. Mom: OO, Dad: AB
Explanation / Answer
1. (C) because the cell will devide into two progeny cells so the probility of getting that mutation in progeny cell will be 50 percent.
2.
(a ) Mom: AO, Dad: BO
A and B are both dominant over 0. This means for example, Having the blood type A (which is called a phenotype) could either mean that this person has the genotype AA or the genotype A0. So we get for all the blood types the following possibilities. So this is only correct answer.