Biology 9700: INHERITED CHANGE Topical Past Paper Questions

Neurofibromatosis type 1 (NF1) is a genetically inherited autosomal condition in which tumours grow in the nervous tissue. (a) If both parents of a child do not have NF1, then the chance that the child will have inherited NF1 is 0%. In a family where one parent has NF1 and the ot…

The fruit fly, Drosophila melanogaster, feeds on sugars found in damaged fruits. A fruit fly with normal features is described as wild type. It has a grey body and its wings are longer than its abdomen. The genes for body colour and wing length are located on different chromosome…

Holstein Friesian cattle are a breed of cattle used by dairy farmers in many countries of the world for the high milk yield of their cows. Fig. 4.1 shows Holstein Friesian cattle. Fig. 4.1 Milk yield in Holstein Friesian cattle is affected by heat stress. Heat stress occurs when…