Question

A true breeding line for the traits white and round is crossed with a true breeding line for traits red and oblong. All offspring are mottled white and red, and oblong. From this we can deduce that:

Select one:

1.Epistasis is present between shape and colour genes

2.Red is dominant and oblong co-dominant with round

3.Red is co-dominant with white and oblong dominant

4.Genes for both colour and shape have one dominant and one recessive allele

5.Recessive epistasis is at play

Answer 1

3. Red is co-dominant with white and oblong dominant.   

EXPLANATION

WHITE ,ROUND X RED, OBLONG

RESULTS

MOTTLED WHITE AND RED, OBLONG

when we cross between traits white,round and red,oblong then the offsprings having traits both red and white for colour and oblong only for shape.

here both white and red is expressed at the same time so it is the case of co-dominant ,and only oblong is expressed then it is case of dominant .

CO-DOMINANT :-when both the phenotype is expressed at the same time