Download Genetics - Iowa State University

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Genetics
Supplemental Instruction
Iowa State University
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Kelly
Biol 211 (1)
Roe
03/09/14
X-linked Punnett Square:
 XB = a dominant allele for good vision.
 Xb= a recessive allele for colorblindness.
 If the mother is colorblind and the father is not, how many offspring will express
colorblindness? Be carriers for colorblindness?
The numbers:
The phenotype ratio for unlinked traits is ______________.
The phenotype ratio for linked traits is_______________.
How is the probability of crossing over related to the distance between genes on a chromosome?
Non-Mendelian Genetics:
Incomplete Dominance Multiple Alleles
Polygenic Inheritance
Pleiotropy
A. One gene affects many phenotypes
B. A child has wavy hair while her parents have curly and straight hair.
C. Blood type is an example
E. Codominant alleles can occur.
F. One example, height, is on a continuum.
G. An in-between phenotype is expressed in F1.
H. Multiple Genes control 1 character.
I. 3 or more alleles for a given gene.
J. A disease, PKU, yields mental retardation and loss of skin and hair pigmentation.
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