Use the Punnett square below to determine the potential offspring for 2 parents

Question

Use the Punnett square below to determine the potential offspring for 2 parents where one parent is AA and the other is aa. The genetic trait being studied is for thumb shape. The allele ''A'' produces a straight thumb, the allele ''a'' produces a bent or ''hitchhiker'' thumb. How many alleles from each parent will be put into a particular square? How many alleles are in each square? Which allele Is dominant? Recessive? What percentage of F1 offspring will have straight thumbs? Hitchhiker thumbs? Do another Punnett Square f o the same genetic trait, Both parents ate F2 offspring from the previous cross (yewl) What genotypes are present in the offspring? What phenotypes are present in the offspring? Which genotypes produce the same phenotype? Which genotype would be one that s homozygous dominant? Which genotype would be one that is heterozygous dominant? Which genotype would be one that is homozygous recessive? What is the ratio of dominant phenotypes to recessive phenotypes? What is Mendel's Principle of Segregation and how does the work you've done today support it?

Explanation / Answer

A

A

a

Aa

Aa

a

Aa

Aa

Parents are AA and aa.

All are heterozygous for straight thumb in F1 generation.

F2 – Aa X Aa

A

a

A

AA

Aa

a

Aa

aa

Among four off springs in F2 generation, 3 have straight thumb and 1 has hitchhiker thumb.

Mendel’s law of segregation says that a pair of alleles representing the traits or characteristics of a gene expression in every parent will get segregated during the formation of reproductive cells. Segregation of genes takes place during meiosis.

In the current problem too, the alleles for straight thumb and hitchhiker thumb are represented by each of the alleles and they get segregated before they are incorporated into the F1 and F2 offsprings.

A

A

a

Aa

Aa

a

Aa

Aa

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