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Dihybrid and polyhybrid cross
10
Kamilla F, Moldir A, Anel A
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Cytological basis of monohybrid cross. Chromosome theory of heredity
Cytological basis of monohybrid cross
Mendel laws
Cytological basis of monohybrid cross
1st law of inheritance
If 2 homozygous organisms cross for a certain character, the progeny of the first generation will be all equal ones between themselves and be equal to one of the ancestors
2nd law of segregation
2nd law of segregation
Mendel deduced this law on having crossed different individuals varieties from a pair of contrasting alleles only one is present an a single gamete and one character dominant and the other recessive in 1st generation and in second generation these character are segregated in the ratio of 3:1 by phenotype and 1:2:1 by genotype
3rd law of independent assortment
3rd law of independent assortment
When there are 2 pairs of contrasting characters then the distribution of each pair to the gametes is independent of the distribution of the other pair of characters or that each of a pair of character may combine with either character of the other pair