B. Because of the presence of hydrogen sulphide in Brass, it combines with oxygen in air and form water, evaporates. So remained sulphide is colourless in air .So Brass gets discoloured in the air.
An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither.
A heterozygous cat has a genotype Hh A hairless cat has a genotype hh When crossed, the results could be any of the following: Hh (with hair) hh (hairless) There is a 50:50 chance or 1: 1 ratio that the offspring will have hair.
