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Genetics Unit

Review Worksheet

1. What is the difference between genotype and phenotype? Give an example for each.

2. One question about basic monohybrid punnett square.

Ex. Purple flowers are dominant over white flowers. If you cross a flower that is heterozygous for purple flowers and a white flower plant, what is the probability that your offspring will be white flowered plants?

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|Phenotype |Genotype |

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3. One question that is a dihybrid punnett square.

Ex. Wolves are sometimes observed to have black coats and blue eyes. Assume further that normal coat color (N) is dominant to black (n) and brown eyes (B) are dominant to blue (b). Suppose the alpha male and alpha female of a pack (these are the dominant individuals who do most of the breeding) are black with blue eyes and normal colored with brown eyes, respectively. The female is also heterozygous for both traits. Show the cross between these two individuals.

Female Genotype:

Allele Combination Possibilities (4):

Male Genotype:

Allele Combination Possibilities (4):

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4. One question about a trait that is either incomplete or codominant.

Ex. In northeast Kansas there is a creature know as a wildcat. It comes in three colors, blue, red, and purple. A homozygous (BB) individual is blue, a homozygous (bb) individual is red, and a heterozygous (Bb) individual is purple. What would be the genotypes and phenotypes of the offspring if a blue wildcat were crossed with a red one?

Do the cross:

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Is this trait incomplete or codominant?

Ex. #2 If you cross a white cow with a red bull, what percentage of the offspring would end up roan (red and white spotted)?

Do the cross:

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Is this trait incomplete or codominant?

5. One question about blood types.

Ex. A man who is heterozygous for type B blood had a baby with a woman who is type AB blood. What type of blood is it impossible for their child to have? Show the cross.

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6. One question about sex-linked traits.

Ex. A human female "carrier" who is heterozygous for the recessive, sex-linked trait causing red-green color blindness , marries a normal vision male. What proportion of their male offspring will have red-green color blindness? Use the letter (N) for normal vision. Remember to use your super scripts to indicate gender.

Female Genotype:

Male Genotype:

Cross:

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Answer:

7. One pedigree question.

Ex. Using the information you have learned about pedigrees, construct a pedigree for the following family. Use E for earlobe attachment. Shade the whole symbol for dominant traits and half of the symbol for heterozygous traits. Unattached earlobes are dominant to attached.

a. Father = heterozygous for unattached earlobes.

b. Mother = homozygous recessive for attached earlobes.

c. Male Child 1 = heterozygous

d. Male Child 2 = homozygous recessive

e. Female Child = heterozygous

Bonus questions on the test are optional. One option is a trihybrid (64 squares), the other option is a complex pedigree.

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