5. In humans, freckles (F) are dominant over no freckles(f) Cross a heterozygous

ID: 212051 • Letter: 5

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5. In humans, freckles (F) are dominant over no freckles(f) Cross a heterozygous freckled individual with an individual with no frec kles. Dihybrid Crosses: garden peas, purple flowers (P) are dominant over white flowers (p) and round seeds (R) are dominant over wrinkled seeds (r). In 6. Cross a homozygous purple/homozygous round pea with a heterozygous purple/heterozygous round pea 7. Cross a heterozygous purple/heterozygous round pea with a heterozy gous purple/heterozygous round pea 8. Cross a heterozygous purple/heterozygous round with a white/wrinkled Cross a homozygous purple/wrinkled with a homozygous purple/ ed

Explanation / Answer

Dihybrid cross are crosses that involve 2 traits, and the square you create will be 4x4. A Punnett Square shows the genotypes two individuals can produce when crossed. To draw a square, write all possible allelecombinations one parent can contribute to its gametes across the top of a box and all possible allele combinations from the other parent down the left side. The allele combinations along the top and sides become labels for rows and columns within the square. Complete the genotypes in the square by filling it in with the alleles from each parent. Since all allele combinations are equally likely to occur, a Punnett Square predicts the probability of a cross producing each genotype.

In the crosses given in question the punnet square will be constructed as follows:

6) PPRR X PpRr

There are 1 distinct phenotypes. All offsprings will be purple with round seeds.

7) PpRr X PpRr

There are 4 distinct phenotypes; Purple and round; Purple and wrinkled; white and round; white and wrinkled

8) PpRr X pprr

There are 4 distinct phenotypes; Purple and round; purple and wrinkled; white and round; white and wrinkled.

9) PPrr X PPrr

There is 1 distinct phenotype; Purple and wrinkled.

PR PR PR PR PR PPRR PPRR PPRR PPRR Pr PPRr PPRr PPRr PPRr pR PpRR PpRR PpRR PpRR pr PpRr PpRr PpRr PpRr

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5. In humans, freckles (F) are dominant over no freckles(f) Cross a heterozygous

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