Biology 2nd Paper CQ-Chittagong Board-2022
1. Despite the presence of the gene responsible for colour. the colour of leghorned cock and hen are white. A cross between white leghorned and white syandotc, in generation all the chickens will be white coloured but in generation the phenotypic ratio of white and coloured chicken become 13:3 instead of .
2. A leaf-like pink coloured mix gland situated below the stomach and in the space between he semicircular coil of duodenum helps in digestion of different food materials. The next parl of alimentary canal between stomach and large intestine performs the most important functions of digestion.
3. Change occurred in organism to adopt with the environment. Slow and sequential morphological changes resulted in developing into a new unique species. Evidences supporting this idea werc provided by several scientists. According to Darwin "variation is the raw material in the development of a new species".
