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1
The condition that results from one allele affecting more than one trait is
A)incomplete dominance.
B)pleiotropy.
C)partial dominance.
D)epistasis.
2
Down syndrome results from
A)the absence of chromosome 21.
B)the presence of an extra chromosome number 21.
C)the absence of two chromosome number 21.
D)crossing over on chromosome number 21.
3
Phenotype describes the actual alleles received from both parents.
A)True
B)False
4
In a particular breed of cats black (B) is dominant and white (b) is recessive. What are the chances of producing white kittens when crossing a Bb male with a Bb female?
A)0%
B)25%
C)50%
D)75%
E)100%
5
Hemophilia involving a lack of blood protein factors VIII and IX is
A)a dominant trait that usually only develops in individuals in their 30s.
B)a recessive trait inherited on autosomes.
C)a sex-linked trait.
D)common in royal families due to several mutations in their genetic material.
E)a dominant trait inherited on autosomes.





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