What fraction of the offspring would have spherical seeds?



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CHALLENGING GENETIC PROBLEMS. For each problem: identify parents’ genotypes, draw Punnett square and answer the questions



In pea plants, spherical seeds (R) are dominant to dented seeds (r). In a genetic cross of two plants that are heterozygous for the seed shape trait.


What fraction of the offspring would have spherical seeds?




In humans, a dimple in the chin (D) is dominant over no dimples in the chin. A man who does not have a chin dimple marries a woman with a chin dimple, whose mother lacked the dimple.


What proportion of their children would be expected to have a chin dimple?

What is the phenotypic ratio for dimples?




=======================================================================================
CHALLENGING GENETIC PROBLEMS. For each problem: identify parents’ genotypes, draw Punnett square and answer the questions

1

In pea plants, spherical seeds (R) are dominant to dented seeds (r). In a genetic cross of two plants that are heterozygous for the seed shape trait.


What fraction of the offspring would have spherical seeds?


2

In humans, a dimple in the chin (D) is dominant over no dimples in the chin. A man who does not have a chin dimple marries a woman with a chin dimple, whose mother lacked the dimple.


What proportion of their children would be expected to have a chin dimple?

What is the phenotypic ratio for dimples?




===============================================================================================
CHALLENGING GENETIC PROBLEMS. For each problem: identify parents’ genotypes, draw Punnett square and answer the questions

1

In pea plants, spherical seeds (R) are dominant to dented seeds (r). In a genetic cross of two plants that are heterozygous for the seed shape trait.


What fraction of the offspring would have spherical seeds?


2

In humans, a dimple in the chin (D) is dominant over no dimples in the chin. A man who does not have a chin dimple marries a woman with a chin dimple, whose mother lacked the dimple.


What proportion of their children would be expected to have a chin dimple?

What is the phenotypic ratio for dimples?




==================================================================================================
CHALLENGING GENETIC PROBLEMS. For each problem: identify parents’ genotypes, draw Punnett square and answer the questions

1

In pea plants, spherical seeds (R) are dominant to dented seeds (r). In a genetic cross of two plants that are heterozygous for the seed shape trait.


What fraction of the offspring would have spherical seeds?


2

In humans, a dimple in the chin (D) is dominant over no dimples in the chin. A man who does not have a chin dimple marries a woman with a chin dimple, whose mother lacked the dimple.


What proportion of their children would be expected to have a chin dimple?

What is the phenotypic ratio for dimples?



=============================================================================================


CHALLENGING GENETIC PROBLEMS. For each problem: identify parents’ genotypes, draw Punnett square and answer the questions

1

In pea plants, spherical seeds (R) are dominant to dented seeds (r). In a genetic cross of two plants that are heterozygous for the seed shape trait.


What fraction of the offspring would have spherical seeds?


2

In humans, a dimple in the chin (D) is dominant over no dimples in the chin. A man who does not have a chin dimple marries a woman with a chin dimple, whose mother lacked the dimple.


What proportion of their children would be expected to have a chin dimple?

What is the phenotypic ratio for dimples?




3

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms must stem from the

marriage of what type of genotypic parents? _____________________________________________



4

When a plant with yellow seeds (dominant) is crossed with a green-seeded plant, some of the offspring is green-seeded


What are the genotypes of the parents?

What are the genotypes of the offspring?

What is the phenotypic ratio of the offspring?


5

Trait fuzzy-skinned fruit (F) is dominant; smooth-skinned fruit (f) is recessive. All offsprings have fuzzy fruits. What are possible parents’ genotype and phenotype?



3

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms must stem from the

marriage of what type of genotypic parents? _____________________________________________




4

When a plant with yellow seeds (dominant) is crossed with a green-seeded plant, some of the offspring is green-seeded


What are the genotypes of the parents?

What are the genotypes of the offspring?

What is the phenotypic ratio of the offspring?


5

Trait fuzzy-skinned fruit (F) is dominant; smooth-skinned fruit (f) is recessive. All offsprings have fuzzy fruits. What are possible parents’ genotype and phenotype?




3

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms must stem from the

marriage of what type of genotypic parents? _____________________________________________



4

When a plant with yellow seeds (dominant) is crossed with a green-seeded plant, some of the offspring is green-seeded


What are the genotypes of the parents?

What are the genotypes of the offspring?

What is the phenotypic ratio of the offspring?


5

Trait fuzzy-skinned fruit (F) is dominant; smooth-skinned fruit (f) is recessive. All offsprings have fuzzy fruits. What are possible parents’ genotype and phenotype?




3

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms must stem from the

marriage of what type of genotypic parents? _____________________________________________



4

When a plant with yellow seeds (dominant) is crossed with a green-seeded plant, some of the offspring is green-seeded


What are the genotypes of the parents?

What are the genotypes of the offspring?

What is the phenotypic ratio of the offspring?


5

Trait fuzzy-skinned fruit (F) is dominant; smooth-skinned fruit (f) is recessive. All offsprings have fuzzy fruits. What are possible parents’ genotype and phenotype?


3

A phenotypic ratio of 3:1 in the offspring of a mating of two organisms must stem from the

marriage of what type of genotypic parents? _____________________________________________



4

When a plant with yellow seeds (dominant) is crossed with a green-seeded plant, some of the offspring is green-seeded


What are the genotypes of the parents?

What are the genotypes of the offspring?



What is the phenotypic ratio of the offspring?


5

Trait fuzzy-skinned fruit (F) is dominant; smooth-skinned fruit (f) is recessive. All offsprings have fuzzy fruits. What are possible parents’ genotype and phenotype?



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