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Exercise 7: Genetics For each genotype below, indicate whether it is heterozygous (HE) or homozygous (HO) AA Bb Cc DD Ee ff Gg HH li jj kk LL Mm nn oo Pp For each of the genotypes below determine what phenotypes would be possible. Purple flowers are dominant to white flowers. PP Pp pp Brown eyes are dominant to blue eyes BB Bb bb Round seeds are dominant to wrinkled seeds. RR Rr rr Long tails are dominant and bobtails in cats are recessive. LL Ll ll 2. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered? 3. A white flowered plant is crossed with a plant that is heterozygous for the trait. a. What percentage of the offspring will have purple flowers? 4. Two plants, both heterozygous for the gene that controls flower color are crossed. a. What percentage of their offspring will have purple flowers? b. What percentage will have white flowers? 5. In pea plants, the allele for tall plants (T) is dominant to the allele for short plants (t). You observe that the offspring of a cross include 78 tall plants and 27 short plants. a. What was the probable allele combination of the two parent plants? b. How would your answer change if the offspring included 121 tall plants and 118 short plants? 6. Can a human male be homozygous for an X-linked character? From which parent does a male receive his X-linked genes? To which sex among his offspring does he transmit his X-linked genes? To which sex does a male transmit genes located on his Y chromosome? 7. Indicate the probabilities of each genotype and phenotype in the children of a woman with blood type O and a man with blood type AB. Genotype(s) Phenotype(s) 8. A woman with blood type A and a man with blood type B have 3 children, one each with blood types A, B and O. What are the genotypes of the parents? 9. Indicate the probabilities of all phenotypes in the offspring of two tall pea plants with purple flowers, both of which are heterozygous for both genes.

Exercise 7: Genetics
For each genotype below, indicate whether it is heterozygous (HE) or homozygous (HO)
AA ____ Bb ____ Cc ____ DD ____
Ee ____ ff ____ Gg ____ HH ____
li ____ jj ____ kk ____ LL ____
Mm ____ nn ____ oo ____ Pp ____
For each of the genotypes below determine what phenotypes would be possible.
Purple flowers are dominant to white flowers.
PP ____
Pp ____
pp ____
Brown eyes are dominant to blue eyes
BB ____
Bb ____
bb ____
Round seeds are dominant to wrinkled seeds.
RR ____
Rr ____
rr ____
Long tails are dominant and bobtails in cats are recessive.
LL ____
Ll ____
ll ____
2. In pea plants purple flowers are dominant to white flowers. If two white flowered plants are cross, what percentage of their offspring will be white flowered?
3. A white flowered plant is crossed with a plant that is heterozygous for the trait.
a. What percentage of the offspring will have purple flowers?
4. Two plants, both heterozygous for the gene that controls flower color are crossed.
a. What percentage of their offspring will have purple flowers?
b. What percentage will have white flowers?
5. In pea plants, the allele for tall plants (T) is dominant to the allele for short plants (t).
You observe that the offspring of a cross include 78 tall plants and 27 short plants.
a. What was the probable allele combination of the two parent plants?
b. How would your answer change if the offspring included 121 tall plants and 118 short plants?
6. Can a human male be homozygous for an X-linked character?
From which parent does a male receive his X-linked genes?
To which sex among his offspring does he transmit his X-linked genes?
To which sex does a male transmit genes located on his Y chromosome?
7. Indicate the probabilities of each genotype and phenotype in the children of a woman with blood type O and a man with blood type AB.
Genotype(s) ____ Phenotype(s) ____
8. A woman with blood type A and a man with blood type B have 3 children, one each with blood types A, B and O. What are the genotypes of the parents?
9. Indicate the probabilities of all phenotypes in the offspring of two tall pea plants with purple flowers, both of which are heterozygous for both genes.

Added by Charles B.

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