![]() ![]() EITHER green seeds of yellow seeds), because these lines were pure-breeding. Generally, dominant alleles are wild-type, and abnormal or mutant alleles are recessive.ģ.3 Even before the idea of a homozygous genotype had really been formulated, Mendel was still able to assume that he was working with parental lines that contained the genetic material for only one variant of a trait (e.g. Based on the phenotypes among the offspring, you might be able to infer the genotype of the wirey-haired parent.Į) From the information provided, we cannot be certain which, if either, allele is wild-type. cross the wirey-haired dog to a homozygous recessive dog ( ww). Another example of this would be the fairly common observation that in some human families, all of the offspring are either girls, or boys, even though the expected ratio of the sexes is essentially 1:1.ĭ) You could do a test cross, i.e. These deviations are due to the random nature in which gametes combine to produce offspring. On the same individual: 50% of hairs are all black and 50% of hairs are all whiteĥ0% of individuals have all white hairs and 50% of individuals have all black hairsģ.1 There is a maximum of two alleles for a normal autosomal locus in a diploid species.ģ.2 a) In the F 1 generation, the genotype of all individuals will be Ww and all of the dogs will have wirey hair.ī) In the F 2 generation, there would be an expected 3:1 ratio of wirey-haired to smooth-haired dogs.Ĭ) Although it is expected that only one out of every four dogs in the F2 generation would have smooth hair, large deviations from this ratio are possible, especially with small sample sizes. List of terms: haplosufficiency, haploinsufficiency, pleiotropy, incomplete dominance, co-dominance, incomplete penetrance, broad (variable) expressivity. In this case, the allele symbols do not imply anything about the dominance relationships between the alleles. In the table below, match the mouse hair color phenotypes with the term from the list that best explains the observed phenotype, given the genotypes shown.
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