You are studying a plant whose seed shape (round, disc or elongated) and seed color (yellow,...

You are studying a plant whose seed shape (round, disc or elongated) and seed color (yellow, green grey) are determined by two different gene loci. The R/r locus controls seed shape and the Y/y locus control seed color. You have some data from single-trait crosses that were carried out by a friend of yours:

-Yellow and green seed plants each breed true when self crossed, but grey seed plants produce offspring of all 3 color seeds.

-Round seed crossed with elongated seed plants produce only disc shaped seed plants.

When two plants having the same phenotype of seed shape and color were crossed, the offspring appeared in the following proportions.

1/16 round yellow 1/8 disc yellow, 1/8 elongated grey,

1/16 elongated yellow 1/8 round grey, 1/8 disc green,

1⁄4 disc grey 1/16 round green, 1/16 elongated green

A) in your cross: what are the (i) genotype of the parents (ii) genotypes of the offspring and (iii) the phenotype of the parents? Draw a Punnett Square to show your answer.

B) what type of allele interaction is occurring for (i) seed shape? What about (ii) seed color? Explain how you can tell.

C) Based on the data from these crosses – is there any sort of epistatic interaction between the genes? Explain why or why not.

Solutions

Expert Solution

A-

Genotype of parents is RrYy

Phenotype of parent - Grey and disc-shaped seed

Genotype of progenies -

1/16 round yellow - YYRR

1/8 disc yellow, - RrYY

1/8 elongated grey- rrYy

1/16 elongated yellow- rrYY

1/8 round grey, - RRYy

1/8 disc green, - Rryy

1?4 disc grey YyRr

1/16 round green, RRyy

1/16 elongated green rryy

B- Seed color is the case of incomplete dominance. As we can see that in heterozygous condition both the allele i.e. Y and y not able to show their phenotypes.

Seed Shape is the case of incomplete dominance. As we can see that in heterozygous condition both the allele i.e. R and r not able to show their phenotypes.

C- Epistasis is a condition in which one gene masks the phenotype of another gene. In our case when both the alleles are present they are showing the new phenotype. So in our case their is no epistasis between the genes

gladiator answered 1 year ago

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