Answer Happy

4. A cattle breeder has DNA tested 135 of his young male calves for a recessive genetic disorder. The test results are given as: FREE, where "**" codes for a genotyped homozygote for the favourable allele; CARRIER, where "*" codes for a genotyped heterozygote; and AFFECTED, where "--" codes for the homozygous unfavourable allele The test results were: Genotype Number of calves 100 ** 27 8 a) What is the allele frequency of the unfavourable allele in his herd? b) If he mates his cows with "**"bulls only, what will be the test result if he tests 100 animals from the next generation (assume he does not select his cows). c) Following on from b (above), what is the allele frequency of the unfavourable allele in this next generation? d) If the breeder decided to use a CARRIER Bull over 100 cows what would be the genotype frequencies? How many AFFECTED calves would he get (round up to 2 decimal places)?