Environmental Effects on Phenotype: Examples and Practice
A Siamese cat usually has paler fur on warmer body regions and darker fur on cooler extremities. A temperature-sensitive variant of tyrosinase, an enzyme needed for pigment production, helps explain the pattern: pigment production is reduced at warmer temperatures and greater at cooler temperatures
Linkage, Nondisjunction, and Pedigrees: Worked Examples
Humans have roughly twenty thousand genes distributed across twenty-three chromosome pairs. Hundreds of genes therefore share each chromosome. During meiosis, nearby loci can travel together, so you should check the evidence before predicting independent assortment. Offspring counts can reveal linka
