3. What is the probability that a parent with the genotype AAbb will produce a g

Question

3.       What is the probability that a parent with the genotype AAbb will produce

                   a gamete with the genotype Ab?

                   a.    1/4  

                   b.      1/2

                   c.      3/4

                   d.       1

                   e.       None of the above.

4.       Most individuals have free earlobes (FF, Ff). Homozygous recessives (ff) have earlobes attached directly to the hear. IF two individuals heterozygous for this trait have a child, what is the probability that the child will have attached earlobes?

                   a.1/2      

                   b.     1/4

                   c.      1/8

                   d.      1/6

          5.       Assume that the Allele C is responsible for normal metabolism while the allele c is responsible for abnormal metabolism. Homozygous recessives die a few months after being conceived since this metabolic disorder is incompatible with life (the allele c is a lethal allele). If two carriers of this trait have a normal child, what is the probability that the child is a carrier?

                   a.      1/2

                   b.      1/4

                   c.      1/8

                   d.      2/3

          6.       Assume that he probability that a boy will be born is ½ and that the chance for a girl is ½. If four babies are born in a given hospital on the same day what is the probability that all four will be boys?

                   a.      1/2

                   b.      1/4

                   c.      1/8

                   d.      1/16

Explanation / Answer

Q3). d

Q4). b

Q5). a

Normal (CC)-1/4

Carriers (Cc)-2/4= 1/2

Affected (cc)-1/4

Q6). d

1/2 * 1/2 * 1/2 * 1/2 =1/16

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