In corn snakes, alleles at two loci control color pattern. Normal individuals (a

Question

In corn snakes, alleles at two loci control color pattern. Normal individuals (and this is the type seen usually seen in the wild) are patterned with conspicuous black outline around red brick red blotches. Individuals which are homozygous recessive cinder condition are black and white patterned, with no red. Amelanistic individuals are homozygous recessive for a condition that inhibits black color-they have the red, but no black outlines.

An amelanistic snake from a true-breeding line is crossed to a cinder snake from a true breeding line. The F1 offspring are all raised to adulthood. What color are they?

Now, imagine that an F1 male is crossed to an F1 female. 16 eggs hatch. Predict the colors of the offspring.

Go online to the corn snake genetics calculator, http://www.corncalc.com/index.jsp, conduct four crosses, and diagram each one.

Explanation / Answer

Genotype:

Normal individuals - RRBB (Both red and black)

Cinder - rrBB (Only black and no red)

Amelanistic individuals : RRbb (Only red and no black)

When rrBB and RRbb are crossed, the genotypes of the offspring is rRBb which is normal

When rRBb x rRBb are crossed.

Normal (9) : RRBB(1), RRBb (2), RrBB(2), RrBb (4)

Amelanistic (3) : RRbb (1), Rrbb (2) : Red

Cinder (3) : rrBB (1), rrBb (2) : Black

New (1) : rrbb (1) : Neither red nor black

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