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Question : Describe inheritance of two gene. |
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Answer» Solution :Mendel also worked with and crossed pea PLANTS that differed in two characters as is seen in the cross between a pea plant that has seeds with yellow colour and round shape and one that had seeds of green colour and wrinkled shape. = Mendel found that the seeds resulting from the crossing of the parents had yellow coloured and round shaped seeds. = Thus yellow colour was dominant over green and round shape dominant over wrinkled. = These results were IDENTICAL to those that he got when he made separate MONOHYBRID crosses between yellow and green seeded plants and between round and wrinkled seeded plants. = Let us use the genotypic symbols .Y. for dominant yellow seed colour and .y. for recessive green seed colour, R for round shaped seeds and r for wrinkled seed shape. = The genotype of the parents can then be written as RRYY and rryy. =The cross between the two plants can be written down as in the given figure SHOWING the genotypes of the parent plants. = The gametes RY and ry unite on fertilisation to produce the `F_1`, hybrid RrYy. =When Mendel self hybridised the `F_1` plants he found that `3//4^(th)` of `F_2` plants had yellow seeds and 1/`4^(th)` had green. = The yellow and green colour segregated in a 3:1 ratio. = Round and wrinkled seed shape also segregated in a 3:1 ratio, just like in a monohybrid cross. 
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