Question

Explain following.

Explain Mendel`s monohybrid progeny with the help of any one cross.

Answer 1

Monohybrid Cross

For monohybrid cross, Mendel began with a pair of pea plants with two contrasting traits i.e., one tall and another dwarf. The cross-pollination of tall and dwarf plants resulted in tall plants. All the hybrid plants were tall. He called this as a first hybrid generation (F1) and offspring were called Filial1 or F1 progeny. He conducted an experiment with all the seven contrasting pairs. He observed that the entire F1progeny showed one pattern in their behavior i.e., they resembled either one of the parents. Another parent character was completely absent.

He continued his experiment with self-pollination of F1 progeny plants. Surprisingly, he observed that one out of four plants were dwarf while other three were tall. The tall and the short plants were in the ratio of 3:1. He also noted that no progeny was in intermediate height i.e., no blending. The result was same for other traits of plants too. And he called them second hybrid generation and offspring were called Filial2 or F2 progeny.

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Answer 2

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A genetic cross between parents that differ in the alleles they possess for one particular gene, one parent having two dominant alleles and the other two recessives. All the offspring (called monohybrids) have one dominant and one recessive allele for that gene (i.e. they are hybrid at that one locus).

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