BIOLOGY

In humans, there are four types of blood: type A, type B, type, AB and type O. The alleles A and B are codominant to each other and the O alleles is recessive to both A and B alleles. So a person with the genotype AA or AO will have A blood. A. what is the possible genotypes will produce type B blood? B. what is the only genotype that will produce type O blood? C. what is the only genotype that will produce type AB blood?

 

1.      IIn cattle, roan color (mixed red and white hairs) occurs in  the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes.  What type of dominance does this demonstrate?

a.       Codominance

b.      Complete dominance

c.       Incomplete dominance

d.      Sex linked trait

 

 

 

An achondroplastic male dwarf marries a woman of average height.  The man’s father was six-feet tall, and both the woman’s parents were of average height.  Achondroplastic dwarfism is autosomal dominant.  If a child inherits two dominant alleles (AA) it does not survive past the first year.

 

1.      How many of their children might be expected to have achondroplasia?

a.       0%

b.      25%

c.       50%

d.      100%

2.      How many of their children might have a genotype of AA?

a.       0%

b.      25%

c.       50%

d.      100%

3.      How many of their children might have a genotype of Aa?

a.       0%

b.      25%

c.       50%

d.      100%

4.      How many of their children might be of average height?

a.       0%

b.      25%

c.       50%

d.      100%

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