Genetic crosses Lab

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Name: Larken McRorie
Date: 12/2/2014
Graded Assignment
Lab Report
Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.
Lab Report: Genetic Crosses 1
You may wish to construct the Punnett squares on scratch paper first before you fill in the Punnett squares on the Lab Report. Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit.
Part 1: Monohybrid Cross—Predicting Freckles in an F1 Generation
Apply your understanding of how alleles assort and combine during reproduction to evaluate a scenario involving a monohybrid cross.
The allele for having freckles (F) is dominant over the allele for not having
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Calculate the ratios of the genotypes and phenotypes of the offspring in the F1 generation.
Answer:
Genotypes: 1FF: 2Ff: 1ff
Phenotypes: 3FF: 1ff 3 freckles: 1 nonfreckled
Part 2: Dihybrid Cross—Predicting Flower Color and Seed Shape
Imagine that you are crossing two plants that are heterozygous for flower color and seed shape. The dominant and recessive alleles for these traits are: purple flowers: P white flowers: p round seeds: R wrinkled seeds: r
(2 points)
1. Determine the genotype of each parent plant and write them below.
Answer:
Genotype of parent plant 1: Pp Rr
Genotype of parent plant 2: Pp Rr
(4 points)
2. How will the alleles for these traits assort into the gametes that each parent might produce? (Hint: For a reminder on how alleles sort independently into gametes, refer to the illustration in Part 2, Question 2, in the Student Guide.)
Answer:
Parent plant 1:
Gamete 1: PR
Gamete 2: Pr PpRr
Gamete 3: pr
Gamete 4: pR
Parent plant 2:
Gamete 1: RP
Gamete 2: pr
Gamete
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