BIO Lab, ABO - General Biology Laboratory BIO 111 Morehouse...

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General Biology Laboratory BIO 111 Morehouse College 3 Human Genetics and Pedigree Worksheet Name Khaleed Alston Date November 7, 2007 1. In humans, the ABO blood types involve two codominant alleles, IA , IB , and the recessive allele i . A man and a woman who are both blood type B have a child who is blood type O. Does the child’s blood type indicate that the man is not its father? Explain your answer. No. If both parents are blood type B, then they could be iBiO thus giving a 25% chance of the child being blood type O. therefore it is very unlikely that man is the father. 2. The incidence of Down’s Syndrome (typically due to an extra copy of chromosome 21) increases with the age of parents, and increases dramatrically for women having children after the age of 35. The parents of a Down’s Syndrome child would both have the normal number of chromosomes. Explain the cause for Down’s Syndrome in prose and with drawings.
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