# What fraction of the offspring would have spherical seeds?

 Date 28.06.2018 Size 57 Kb.
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?