Mendelian Genetics.1 pp.Handout.2013

# Step 1 calculate the allelic frequencies genotype

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: henotype Observed Genotype Frequency YY Green 0.64 Yy Green 0.32 yy Blue 0.04 •  Is this population in Hardy-Weinberg equilibrium? •  What explains the low frequency of blue birds? Step 1: Calculate the allelic frequencies Genotype Phenotype Observed Genotype Frequency YY Green 0.64 Yy Green 0.32 yy Blue 0.04 Q1: Does the problem state that the populations is in H-W equilibrium? A1: _____!!!!! So you better count alleles!!!!!! •  p(Y) = freq (YY) + ½ freq (Yy) = _____ + _____ = _____ •  q(y) = freq (yy) + ½ freq (Yy) = _____ + _____ = _____ Q2: Is the population in Hardy-Weinberg equilibrium? Q. Is the population in Hardy-Weinberg equilibrium? Step 2: Calculate the EXPECTED GENOTYPIC frequencies •  p(Y) = freq (YY) + ½ freq (Yy) = 0.64 + 0.16 = 0.80 •  q(y) = freq (yy) + ½ freq (Yy) = 0.04 + 0.16 = 0.20 p2 = _____= _____ 2pq = _____ = _____ q2 = _____ = _____ " Genotype Observed Genotype Frequency Expected Genotype Frequency YY 0.64 _____ Yy 0.32 _____ yy 0.04 _____ A. _____...it's ____ in Hardy-Weinberg equilibrium. Now I love those little green budgies Genotype Phenotype Old Frequency New Frequency YY Green 0.64 0.36 Yy Green 0.32 0.28 yy Blue 0.04 0.36 •  Is this population STILL in Hardy-Weinberg equilibrium? Step 1: Re-calculate the allelic frequencies Genotype Phenotype Observed Genotype Frequency YY Green 0.36 Yy Green 0.28 yy Blue 0.36 Q1: Does the problem state that the populations is in H-W equilibrium? A1: ______!!!!! So you better count alleles!!!!!! •  p(Y) = freq (YY) + ½ freq (Yy) = _____ + _____ = __...
View Full Document

Ask a homework question - tutors are online