In mice, agouti fur is a dominant trait resulting in individual hairs having a light band of pigment on an otherwise dark hair shaft. A mouse with agouti fur is shown here, along with a mouse with solid color fur, which is the recessive phenotype (A = agouti; a = […]

Chupacabras are mammals with hair length that varies from no hair to very long. It is known that two genes affect the length of a chupacabra’s hair and that the genes have additive effects. A hairless organism has the genotype G1G1H1H1 and a very long haired organism has the genotype […]

Kris and Kurt are twins. You are interviewing them together. You drop a paperclip on the floor while talking to them. You immediately leave the room. You return about 5 minutes later and ask if either of them remember what happened just before you left the room. Neither of them […]

Loss of 15q 12, the PWS/AS region produces different symptoms depending on the parent of origin. PWS results from the loss of paternal copies of this region. Deletion of the same region on the maternal chromosome causes AS. Human SNRPN, a gene in the deleted region is monoallelically expressed in […]