2. Mendel's Laws of Inheritance

Dihybrid Cross

Multiple Choice
In melons, spots (S) are dominant to no spots (s) and bitterness (B) is dominant to sweet (b). Answer the following questions that arise from a crossing of a homozygous dominant plant with a homozygous recessive plant. Assume Mendelian inheritance. I. What is the F2 phenotypic ratio if the F1 generation is intercrossed?
Open Question
Assume you have mated a homozygous dominant purple, square plant with a homozygous recessive pink, spherical plant. What is the proportion of purple and spherical plants that would be produced in the F₂ generation?
Open Question
Write out all of the following gametes that can be produced from individuals with the following genotypes.
a. AaBB
b. AaBb
c. AaBbCc
d. AaBbcc
Multiple Choice
Two organisms with the genotypes Aa bb Cc Dd Ee and Aa Bb Cc dd Ee were crossed. Use the branch method to determine the proportion of the following genotypes in the offspring. I. aa bb cc dd ee
Multiple Choice
Two organisms with the genotypes Aa bb Cc Dd Ee and Aa Bb Cc dd Ee were crossed. Use the branch method to determine the proportion of the following genotypes in the offspring. II. Aa bb Cc dd ee
Multiple Choice
Two organisms with the genotypes Aa bb Cc Dd Ee and Aa Bb Cc dd Ee were crossed. Use the branch method to determine the proportion of the following genotypes in the offspring. III. AA BB CC Dd ee
Open Question
Compare and contrast the following terms:

dihybrid cross and trihybrid cross
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Open Question
For the cross Aabb×aaBb, what is the expected genotype ratio? What is the expected phenotype ratio?
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Open Question
Mendel crossed peas having round seeds and yellow cotyledons (seed leaves) with peas having wrinkled seeds and green cotyledons. All the F₁ plants had round seeds with yellow cotyledons. Diagram this cross through the F₂ generation, using both the Punnett square and forked-line, or branch diagram, methods.
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Open Question
Based on the preceding cross, what is the probability that an organism in the F₂ generation will have round seeds and green cotyledons and be true breeding?
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Open Question
Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

If a dihybrid plant is self-fertilized,
(1) 9/16 of the progeny will have the same phenotype as the F₁ parent.
(2) 1/16 of the progeny will be true-breeding.
(3) 1/2 of the progeny will be heterozygous at one or both loci.
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Open Question
Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.

If a dihybrid cross is performed, the expected genotypic ratio is 9:3:3:1.
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Open Question
In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P₁ individuals are homozygous, work the following crosses through the F₂ generation, and determine the genotypic and phenotypic ratios for each generation.gray, long x gray, vestigial
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Open Question
In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P₁ individuals are homozygous, work the following crosses through the F₂ generation, and determine the genotypic and phenotypic ratios for each generation.gray, vestigial x ebony, long
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Open Question
In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P₁ individuals are homozygous, work the following crosses through the F₂ generation, and determine the genotypic and phenotypic ratios for each generation.gray, long x ebony, vestigial
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