two heterzygous parents are crossed.if the two locii are linked what would be the distribution of phenotypic features in F1 generation for a dihybrid cross?

What characteristics are being measured?

If you are dealing with merely dominant/recessive traits for one pair of genes with heterozygous parents, by chance 75% will have the dominant feature and 25% will show the recessive trait.

http://www.google.com/search?client=safari&rls=en&q=punnett+square&ie=UTF-8&oe=UTF-8

I hope this helps.

To determine the distribution of phenotypic features in the F1 generation of a dihybrid cross with linked loci, we need to understand the concept of linkage and recombination.

Linked loci are located on the same chromosome and tend to be inherited together because they are physically close to each other. Recombination events can occur during meiosis where the genetic material is exchanged between homologous chromosomes, leading to new combinations of alleles.

In a dihybrid cross with linked loci, if the two heterozygous parents are crossed, the distribution of phenotypic features in the F1 generation will depend on the degree of linkage and the occurrence of recombination.

Let's assume that the two loci being studied are AaBb and their corresponding alleles are designated as A, a, B, and b. Each parent has one allele for each locus, and they are heterozygous (AaBb).

If the two loci are completely linked, meaning there is no recombination between them, the alleles A and a will always be inherited together, as will the alleles B and b. Therefore, all the offspring in the F1 generation will display the parental phenotypic features, and there will be no new combinations of alleles.

However, if the two loci are linked but some recombination events occur, there will be a mixture of parental and recombinant phenotypic features. Recombination can happen if there is a chiasma (crossing over) between the two loci during meiosis.

The distribution of phenotypic features in the F1 generation can be determined by examining the types of gametes that can be produced based on the possible recombinations. The actual proportion of phenotypes observed will depend on the proximity of the loci and the frequency of recombination.

To calculate the distribution of phenotypic features more accurately, one can perform a chi-square analysis or use the LOD (logarithm of odds) score method, which considers the recombination frequencies to estimate the distance between loci.

In summary, if two heterozygous parents are crossed and the two loci are completely linked, all the offspring in the F1 generation will display the parental phenotypic features. If recombination occurs between the linked loci, a mixture of parental and recombinant phenotypic features will be observed, with the specific distribution depending on the frequency of recombination.