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Vanie Mangal, Robert Rock, Keturah Reed, Christopher Reyes A.P. Biology December 28, 2007 Period C-3 11. Imagine that a newly discovered, recessively inherited disease is expressed only in individuals with type O blood, although the disease and blood group are independently inherited. A normal man with type A blood and a normal woman with type B blood have already had one child with the disease. The woman is now pregnant for a second time. What is the probability that the second child will also have the disease? Assume that both parents are heterozygous for the gene that causes the disease. Blood Type A= A antigens on blood cells O= no antigens on blood cells B= B antigens on blood cells Mother BODd x x Disease D= Dominant allele which doesn’t trigger the disease. d= Recessive allele which triggers the disease. Father AODd AD Ad OD Od BD ABDD ABDd BODD BODd Bd ABDd ABdd BODd BOdd OD AODD AODd OODD OODd Od AODd AOdd OODd OOdd There is a 1 in 16 chance of giving birth to a child with the disease. 12. In tigers, a recessive allele causes an absence of fur pigmentation (a white tiger) and cross-eyed condition. If two phenotypically normal tigers that are heterozygous at this locus are mated, what percentage of their offspring will be cross eyed? What percentage will be white? Alleles O= normal tiger with fur pigmentation and regular eyes o= white tiger with crossed eyes O o O OO Oo o Oo oo 25% of the offspring will be white and cross-eyed while the other 75% will appear normal. 13. In corn plants, a dominant allele “I” inhibits kernel color, while the recessive allele “i” permits color when homozygous. At a different locus, the dominant allele “P” causes purple kernel color, while the homozygous recessive genotype “pp” causes red kernels. If plants heterozygous at both loci are crossed what will be the phenotypic ratio of offspring? Alleles I= inhibits kernel color i= permits kernel color when homozygous P= purple kernel color p= red kernel color when homozygous IP Ip iP ip IP IIPP IIPp IiPP IiPp Ip IIPp IIpp IiPp Iipp iP IiPP IiPp iiPP iiPp ip IiPp Iipp iiPp iipp No Kernel Color: Purple Kernel Color: Red Kernel Color 12 : 3 : 1