Genetics Problems: Punnett Squares (Due 11/07) 1. Complete a Punnett square to s

Question

Genetics Problems: Punnett Squares (Due 11/07) 1. Complete a Punnett square to show the genotypes and phenotypes expected for the following cross: heterozygous tall x heterozygous tall 2. In humans, the gene for brown eyes (B) is dominant to the gene for blue eyes (b) and the gene for right handedness (R) is dominant to the gene for left handedness (r). Two individuals, heterozygous at both loci,have children. Complete a Punnett square to show the expected genotypes and phenotypes of the offspring Summarize the ratio of the phenotypes 3. In chimpanzees, straight fingers are dominant to bent fingers. Complete a Punnett square to show the genotypes and phenotypes expected for the following cross: heterozygous straight x homozygous bent. Use standard upper/lower case letters to indicate traits. 4. In four o'clock flowers, red plants are homozygous for the allele (R) of the gene for flower color. Plants with white flowers are homozygous for the (r) allele of the same gene. Plants with pink flowers are are heterozygous for these two alleles. Complete a Punnett square to show genotypes and phenotypes that are expected when plants with pink flowers are intercrossed flowers ere instypes that are expected when plants wih *MAKE SURE YOU CLEARLY LABEL GENES AND THE ASSOCISTED 29

Explanation / Answer

T

t

T

TT

Tt

t

Tt

tt

So, the genotypic ratio is 1 (TT) : 2 (Tt) : 1 (tt)

Phenotypic ratio is 3 (tall) : 1 (short).

T

t

T

TT

Tt

t

Tt

tt

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