Eye color: The myth. One of the oldest myths in human genetics is that having blue eyes is determined by a single gene, with the allele for blue eyes recessive to the allele for non-blue eyes (green, brown, or hazel).Many people who know nothing else about genetics think that two blue-eyed parents cannot have a brown-eyed child.ye color: The myth. One of the oldest myths in human genetics is that having blue eyes is determined by a single gene, with the allele for blue eyes recessive to the allele for non-blue eyes (green, brown, or hazel).
Micrometer Caliper. a measuring instrument whose conversion mechanism consists of a screw-nut micropair. Micrometer calipers are used to measure linear dimensions by the absolute contact method.omplete turns are read from a scale marked on the hub of the micrometer caliper, and fractions of a turn are read from a circular scale marked on the drum. A displacement of the screw of not more than 25 mm is optimum because of the difficulty of manufacturing a screw with an accurate pitch over a greater length.
The vernier caliper is a device used in measurements. The vernier caliper consists of a main scale and a vernier scale which is attached to the main scale but movable throughout the length of the main scale.The vernier caliper measures the separation between the jaws of the vernier caliper.hen the jaws are moved apart so that the 1 of the vernier scale coincides with the 0.1 of the main scale, the jaws are moved apart by a distance of 0.01 cm, which is 1/10th of the smallest reading of the main scale. The general formula for measurements in vernier caliper is,