Genetic Problem. Please help out.

[BLoCKHeaD]

I have a question and would greatly appreciate if I could get a little help on it.

Consider what would happen during meiosis in a gamete whose diploid number of chromosomes is 4 (2n=4, ie., two sets of homologous chromosomes). Assume that on each set of homologous chromosomes there is a heterozygous pair of alleles for a given trait. What are the genotypic and phenotypic ratios that could result? Use a Punnett Square to Describe the Results.

I know how to make a punnett square with information of alleles but I don't really understand the question? does anybody else? Thanks

[Nick]

I would assign a genotype first so for the example lets say Bb Bb

First write down your parental genotype Bb X Bb

The write possible gametes B b X B b

Then write possible childrens genotype BB Bb bB bb

Then write possible phenotype 3: Dominant Trait 1: Reccesive
So genotype ratio will be 1:2:1 BB:Bb:bb
phenotype ratio will be 3:1 dominent gene:reccesive gene

Hope this helps

[lohita]

genotypic - hetrozygous , because of the presence of dominant allele
phenotypic - deploid

[MrMistery]

This problem is rulled by Mendel's laws. Might want to take a look at them. Maybe you will understand it beter after that

[Nick]

Yeh sorry mine is wrong as i read the qst as hetrozygous not homo sorry mate