Quiz208 - General Genetics Page 1 of 3 General Genetics...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
General Genetics 3100:211 Fall, 2008 Quiz 2 Form A 1. Polydactyly is a rare autosomal dominant trait that is 80% penetrant. What is the chance that a child born to an affected father and a normal mother will have the disorder? 0.4 2. The cross of two AaBb individuals with red phenotype has a phenotypic ratio of 12 red, 3 orange and 1 white. What proportion of a testcross with a AaBb individual will have the orange phenotype? 1/4 3. In sheep there are two colors, grey and black, that are the result of a single locus with two alleles. For the grey phenotype homozygotes are lethal and never develop. From the cross of a grey male with a black female, what proportion of the offspring will have grey coat? 1/2 4. From the cross I A i Hh X I A I B Hh, what proportion of the offspring will have B type blood? 3/8 5. From an individual of genotype Ab/aB Dd, what proportion of the gametes will have abd? Assume the A and B loci are 16 units apart on chromosome 4 and the D locus is on chromosome 6. 0.04 6. In a certain cross of three linked loci only 6 double crossovers were detected in 1000 offspring. If the distance between the loci are, D---12---E---18---H, what is the coefficient of coincidence for these three loci? 0.278 7. The A and D locus are linked and 59 map units apart. If AD/ad is crossed to ad/ad, what proportion of the offspring will have a A-D- phenotype? 1/4 8. If the parental gametes for three linked loci are Dfg and dFG. The double crossovers were identified as DFg and dfG. Which locus is in the middle? F
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

Quiz208 - General Genetics Page 1 of 3 General Genetics...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online