Part A. Dihybrid Genetic Problems As discussed in Exercise II, dihybrid crosses involve the inheritance of two different traits and therefore two sets of alleles. We can determine the genotypes of the offspring of a dihybrid cross by using a Punnett square. The first step in solving this kind of problem is to determine the number of different kinds of gametes produced by each parent. Mendel's principles of segregation and independent assortment are both invoked in the identification of the genetic composition of the gametes. The results of the Punnett square can be most easily interpreted if the alleles are recorded in a consistent order. Both alleles governing a given characteristic should always be written side by side and the dominant allele in heterozygous individuals should always be recorded in the first position. The example given here will illustrate a procedure for you to follow in working subsequent problems. A homozygous tall, red-fruited tomato plant is pollinated by a homozygous dwarf, yellow- fruited plant. The parental genotypes are DDRR (female) and ddrr (male). 26. What alleles will be carried by the eggs? By the sperm? 27. What are the possible genotypes of the progeny?. The phenotypes the progeny? The Punnett square for this cross would appear as follows: Parents: DDRR x ddrr Punnett square: DR dr DdRr neig - SE Isarton Hew SED 201 eri v zadie 16dW The resulting F1 plants have the genotype DdRr. These F1 plants are now self-pollinated. 28. What possible combinations of alleles will be carried by the sperm from the F₁ plants? By the eggs?
Part A. Dihybrid Genetic Problems As discussed in Exercise II, dihybrid crosses involve the inheritance of two different traits and therefore two sets of alleles. We can determine the genotypes of the offspring of a dihybrid cross by using a Punnett square. The first step in solving this kind of problem is to determine the number of different kinds of gametes produced by each parent. Mendel's principles of segregation and independent assortment are both invoked in the identification of the genetic composition of the gametes. The results of the Punnett square can be most easily interpreted if the alleles are recorded in a consistent order. Both alleles governing a given characteristic should always be written side by side and the dominant allele in heterozygous individuals should always be recorded in the first position. The example given here will illustrate a procedure for you to follow in working subsequent problems. A homozygous tall, red-fruited tomato plant is pollinated by a homozygous dwarf, yellow- fruited plant. The parental genotypes are DDRR (female) and ddrr (male). 26. What alleles will be carried by the eggs? By the sperm? 27. What are the possible genotypes of the progeny?. The phenotypes the progeny? The Punnett square for this cross would appear as follows: Parents: DDRR x ddrr Punnett square: DR dr DdRr neig - SE Isarton Hew SED 201 eri v zadie 16dW The resulting F1 plants have the genotype DdRr. These F1 plants are now self-pollinated. 28. What possible combinations of alleles will be carried by the sperm from the F₁ plants? By the eggs?
Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter3: Transmission Of Genes From Generation To Generation
Section: Chapter Questions
Problem 16QP: More Crosses with Pea Plants: The Principle of Independent Assortment Consider the following cross...
Related questions
Topic Video
Question
100%
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 5 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Recommended textbooks for you
Human Heredity: Principles and Issues (MindTap Co…
Biology
ISBN:
9781305251052
Author:
Michael Cummings
Publisher:
Cengage Learning
Biology: The Unity and Diversity of Life (MindTap…
Biology
ISBN:
9781337408332
Author:
Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:
Cengage Learning
Biology: The Unity and Diversity of Life (MindTap…
Biology
ISBN:
9781305073951
Author:
Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:
Cengage Learning
Human Heredity: Principles and Issues (MindTap Co…
Biology
ISBN:
9781305251052
Author:
Michael Cummings
Publisher:
Cengage Learning
Biology: The Unity and Diversity of Life (MindTap…
Biology
ISBN:
9781337408332
Author:
Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:
Cengage Learning
Biology: The Unity and Diversity of Life (MindTap…
Biology
ISBN:
9781305073951
Author:
Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:
Cengage Learning