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Biology (Biological Sciences)
Michael Harrington

Biology 207 - Practice questions 10 - Population genetics Question 1 In a wild population of sneetches you notice that 2/3 of the sneetches have stars on their bellies and 1/3 do not. This phenotype is due to a single autosomal gene named B. a) If the Btarallele is dominant to the Bostarallele what are the allele frequencies in this population? b) If the Btarallele is recessive to the Bstarallele what are the allele frequencies in this population? Question 2 Both of the populations of flowering plants I used in class were in HWE. Consider a third population. In this field there are 116 red, 211 pink, and 173 white plants. a) Is this population in HWE? b) Assuming random breeding, no selection, etc.; what will be the genotypic and phenotypic ratios in the offspring population? c) Is the offspring population in HWE? Question 3 Hemoglobin, the oxygen transporter found in red blood cells is made of two alpha globin and two beta globin proteins. The GLU6VAL mutation in the HBB gene makes a defective beta globin protein. People heterozygous for this mutation are said to have sickle cell trait while people homozygous for this allele have sickle cell disease. It is com
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