Dominant and Recessive gene

• In a cross, the characters that appear in the F1 generation are called dominant, and other that remain unexpressed is called recessive.
• For example, if gene A indicates brown eyes and is dominant and gene “A” which is blue eyes is recessive. The offspring would have brown eyes.
• Each trait and response of an individual depends on his heredity and environment. Therefore, to know about the individual, it is necessary to understand his heredity and environment.
• According to geneticists, sex is also inherited. They say that there are two big chromosomes.
• They have named these chromosomes as ‘X’ and ‘Y’. In the germ cells of the male, there is one big ‘X’ chromosome and a small ‘Y’ chromosome.
• If the germ cell engaged in the formation of a creature an ‘X’ chromosome of the mother and the other ‘X’ chromosome of the father enter, then the child will be a female, and contrary to this, if in the germ cell an ‘X’ and a ‘Y’ chromosome enter, the child will be a male.
• A study of chromosomes has revealed that genes of the ‘X’ chromosome are comparatively stronger than the genes of the ‘Y’ chromosome.
• An individual’s heredity depends on the genes of his parents, that is, whatever one gives to his children is through the genes.