Determining whether clean groundwater has become dirty and what caused any contamination is a complex pursuit. Stephen Osborn and three colleagues from Duke University set out to learn whether drinking water was really being contaminated by nearby hydrofracking. Osborn’s team focused on sites in northeastern Pennsylvania and adjacent New York, […]

Nucleus Structure: a double membrane bound eukaryotic organelle containing the chromatin (supercoiled DNA) Effect if lost: the cell would not be able to replicate. Mitochondria: a double membrane bound eukaryotic organelle that also contains DNA and is responsible for energy .Effect if lost: the cell would not be able to […]

Q1. In Drosophila melanogaster, vestigial (short) wings (vg) are caused by a recessive allele of a gene that independently assorts with a gene pair that influences body hair. Hairy (h) results in a hairy body. A cross is made between a fly with normal (wild) wings and a hairy body […]

1) Dentinogenesis imperfecta is a tooth disorder involving the production of dentin sialophosphorprotein, a bone-like component of the protective middle layer of teeth. The trait is inherited as an autosomal (i.e. traits are inherited regardless of the sex) dominant allele located on chromosome 4 in humans and occurs in about 1 in […]