Question: In maize, two plants that are both heterozygous for the recessive alleles a and b are crossed. What frequency of double-mutant progeny will appear if a and b are 7.2 map units apart, and both parents carry a and b in repulsion (trans)? Question: Why are the cells of the stratum […]

In order to ensure that chromosomal DNA is replicated once and only once in each cell cycle, eukaryotic cells have evolved a complex system of control involving Cdc6, a pre-replicative complex, Origin recognition complex and S-Cdk. A. You activate the promoter of Cdc6 so that gene expression and protein production […]

1)The allele responsible for the Siamese coat-color pattern produces an unstable tyrosinase enzyme. This type of gene product is an example of what type of allele? 2) Determine which mode of inheritance produces heterozygotes with phenotypes that differ from either homozygote but more closely resembles one homozygous phenotype than the other? […]

In early spring, Dr. Tom Wilson notices that there is an equal distribution of long and short stemmed buttercups in the vacant lot across the street from his house as well as in his own backyard. In late summer he notices that there are mostly long stemmed buttercups in the […]