The next THREE questions deal with Joh Blo and his A, B, and C genes. (Joh is a

Question

The next THREE questions deal with Joh Blo and his A, B, and C genes. (Joh is a dance major who hasn't taken Genetics, so he does not understand basic principles of inheritance.) You will learn more about these three genes in the questions. 8. Joh's genotype is AaBbCC, where dominant alleles are symbolized by uppercase and recessive alleles are symbolized by lowercase letters, respectively. Apply the LAW OF SEGREGATION and the LAW OF INDEPENDENT ASSORTMENT to determine which one of the following is a possible genotype for one of Joh's sperm cells. 9. If the A and B genes are on different chromosomes, predict the GENOTYPIC RATIOS of the possible offspring Joh can make with his wife Jayne Blo, who has the same genotype he does. (Hint: recall that the different possible gametes resulting from independent assortment of alleles and their relative frequencies can be predicted by EITHER a Punnett square OR the branch method.) 10. If the B and C genes are on the same chromosome, where one carries the alleles BC and its homolog carries the alleles bC, which of the following is a complete list (separated by commas) of the possible sperm cells that Joh can produce, IF NO CROSSING OVER OCCURS?(The A gene has been omitted for simplicity.)

Explanation / Answer

Mendel's law of independent assortment is that the alleles of two or more different genes get sorted into the gametes independently of one to another. In other words, allele a gamete receives for the one gene does not influence the allele received for the another gene.

Trihybrid crosses: The basic concepts are same as with mono or dihybrid crosses

Just remember that the each gamete must have ONE COPY OF EACH each gamete and random segregation and independent random segregation still apply.

Punnet square for trihybrid cross ABC aBC AbC abC ABC AABBCC AaBBCC AABbCC AaBbCC aBC AaBBCC AaBBCC AABbCC aaBbCC AbC AABbCC AaBbCC AAbbCC AabbCC abC AaBbCC aaBbCC AabbCC aabbCC Phenotypic Ratio 10    : 3    : 2    : 1

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