Two heterozygous parents are crossed. If the two loci are linked, then what would be the distribution of phenotypic features in the F1generation for a dihybrid cross?
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=>>If the two loci of characters are linked then the distance separating them will be very small and recombination will not be able to take place in between them. Thus no segregation can be observed. As the parent is heterozygous thus both dominant and recessive alleles are present on the two homozygous chromosomes and one chromosome is obtained by the gamete. Thus, in the F1 generation for a dihybrid cross, if this gamete contains the dominant traits and is fertilized by either dominant or recessive alleles of the same trait from the other parent the dominant phenotypic character are observed.
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Linkage is defined as the coexistence of two or more genes in the same chromosome. If the genes are situated on the same chromosome and lie close to each other, then they are inherited together and are said to be linked genes.
For example, a cross between yellow body and white eyes and wild type parent in a Drosophila will produce wild type and yellow white progenies. It is because yellow bodied and white eyed genes are linked. Therefore, they are inherited together in progenies