1) The inheritance of the ABO blood types in humans can best be explained by: a)

Question

1) The inheritance of the ABO blood types in humans can best be explained by:

a) multiple alleles   b) polygenic inheritance   c) heteroplasmy   d) linked genes   d) simple mendelian genetics

2) All of the following are true about cancer except?

a) cancer may develop in people of all ages

b) lifestyle choices draatically influence cancer risk

c) many cancers have been linked to mutant p53 genes

d) cancer usually results fro a single gene mutation

e) some of the genes involved in onset or progession of cancer include those encoding growth factors, transcrption factors and repair genes.

3) A bacterium, such as E.coli, which has an F plasmid integrated into its genome is called a(n):

a) lysogen

b) HFR strain

c) partial diploid

d) auxotroph

e) virulent strain

a) lysogen

b) HFR strain

c) partial diploid

d) auxotroph

e) virulent strain

Explanation / Answer

1). a) multiple alleles

Human blood group is determined by multiple allele system, in which IA and IB are co-dominant to each other and dominant over IO.

2). d) cancer usually results from a single gene mutation

The uncontrolled division of cells is known as cancer. Cancer can affect people of any age group, and is greatly influenced by life style and food habits. In many cases, cancer is associated with multiple gene mutations.

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