Differentiate between monohybrid cross and dihybrid cross. |
Or |
Explain how test cross helps in identifying the genotype of the organism. |
Answer:
Differences between monohybrid cross and dihybrid cross are as follows
Monohybrid cross Dihybrid cross It is a cross between two individuals taking a single contrasting trait at a time. It is a cross between two individuals taking two contrasting traits at a time. It helps to study the inheritance of a pair of allele. It helps to study the inheritance of two pairs of alleles. The phenotypic ratio in \[{{F}_{2}}\]- generation is 3 : 1 Phenotypic ratio in \[{{F}_{2}}\]- generation is 9 : 3 : 3 : 1. The genotypic ratio in \[{{F}_{2}}\]- generation is 1 : 2 : 1. The genotypic ratio in \[{{F}_{2}}\]- generation is 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1. Or Test cross is a type of cross made between unknown dominant genotype and the recessive parent. For example, when \[{{F}_{1}}\] hybrid (Tt) is crossed with or a pure dwarf plant (tt), 1 : 1 ratio is obtained among progenies.
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