University:
Indiana University South Bend
Course:
BIOL-L 101 | Introduction to Biological Sciences
Academic year:

2021
Views:

358

Pages:

1
Author:

Rose G

4 Polydactyly is a genetically based human trait which results in extra fingers and toes. With one form of this disorder, the polydactyly allele (P) is dominant to the allele for the normal number of digits (fingers and toes) (p). A polydactyl man that has a father with polydactyly and a mother without polydactyly marries a normal woman with a family of no polydactyl abnormalities. What is the chance of polydactyly in their first child? P P Pe PP P PP 50% chance for any child, not Just. ist Child Codd's reset with each child) 5 In guinea pigs, black fur color (B) is dominant over whitfar (b) color. You are given a black guinea pig and a white guinea pig to cross, without knowing their genotypes. Show the two possible crosses and determine for each what percentage of homozygons recessive babies would be produced by the cross. B b Genotypes 2:2 Bobb Phenotypes 2.2 Black White BB bBb Bb b Bb Bb Genotypes 0:410 bb 6 A woman with the rare recessive disease phenylketonuria (PKU), which can be Phenotype Black Write 4:0 treated with a diet of having low levels of the amino acid phenylalanine, was told that it was unlikely her children would inherit PKU because her husband did not have it. However, her first child had PKU. What is the most likely explanation? Assuming this explanation is true, what would be the probability of her second child hoving PKU? The husband must be a carrier (heterozygous) for PKU P Pr PP 50% chance second child will have PKU