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GENETICS STRENGTHENING THE NATIONAL HERD ry RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RRYY Rryy ALLELE Variants of genes that control characteristics. rY RyYY RRYY rrYY rrYy HOMOZYGOUS Having identical pairs of alleles (AA or aa). ry RrYy Rryy rrYy rryy HETEROZYGOUS Having different pairs of alleles (Aa or aA). Affected Female Wild Type Male Wild Type Female I AT AL HER ON D, S Affected Male NZ. T HE N PARENT 2 rY AME FO EN R THROUGH PEDIGREE CHARTS Ry TH IDENTIFYING TRAITS RY IN Identified through genetic data and pedigree records, came from a gene present before 1960. R:Solid coat r: Spotted coat Y: Black coloured face y:White coloured face DAIRY COW SMALL CALF SYNDROME PARENT 1 LL BLAD: Affects white blood cells, causing extreme susceptibility to infection. CVM: Responsible for aborted foetuses and stillborn calves. CITRULLINAEMIA: Ataxia, aimless wandering, blindness, head pressing, convulsions and death. Where both parents carry the recessive gene there is one in four chances that the progeny will be affected. A BVSC GENETIC TRAITS, MUTATIONS & DEFECTS GENETIC DEFECTS 1950 New Zealand techniques for freezing semen improved meaning the best bulls could be used long after they were dead. www.rosieseducation.co.nz
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