Biology 1010: Spring 2017
Laboratory Six: Genetic Crosses
Name: Kevin Gutierrez
Lab section: FEAB
Lab instructor Name: Mahwish Ashfaq
Last 4 digits of your CUNYFirst Empl ID #:7386
Direction: There is no simulation for this report. Completion of this lab report will be
based on reading Chapter 7 and using the word file entitled Lab 6 Handout: Sample
Genetic Crosses posted on Launchpad as a guide. Table 1: Below is a list of the phenotypes used in this lab. These are all single gene traits
that show complete dominance. Use this information to set up and analyze your crosses.
Trait
Flower color
Plant Height
Seed Shape
Seed Color Dominant phenotype
Purple flowers
Tall plants
Smooth seeds
Yellow seeds Recessive Phenotype
White flowers
Short Plants
Wrinkled seeds
Green seeds Part One: Symbols and definitions:
1. Short answer questions:
a. What is a gene? (0.25pts)
A gene is a unit of heredity that is passed on from a parent to its offspring and is
used to determine the characteristics of the offspring.
b. What is an allele? Give an example of 2 alleles of a human gene. (0.25 pts)
An allele is a trait of the gene. Individuals have two copies of each gene inherent from both
parents; examples of this could include things like the offspring’s blood type, hair or eye color,
etc.
c. What is the difference between an organism that is a homozygote and one that is a
heterozygote? (0.25 pts)
A homozygote is an individual organism with two copies of the same allele that determines a
specific trait, while a heterozygote has a copy of two different alleles for the same trait.
d. What is the difference between an organism’s genotype and its phenotype? (0.25 pts)
An organism’s phenotype would be the outward appearance of that individual, where the
genotype would be the organism’s genetic composition. 2. For each trait in the table below, indicate ALL OF THE GENOTYPES that are possible.
Use the first letter of the dominant trait to indicate the trait. (2pts)
Trait
Flower color
Plant Height
Seed Shape
Seed Color Dominant genotype(s)
Purple = PP Pp pP
Tall = TT Tt tT
Smooth = SS Ss sS
Yellow = YY Yy yY Recessive genotype(s)
White = pp
Short = tt
Wrinkled = ss
Green= yy Part Two: Genetic Crosses
1. Pick three of the crosses to complete using any 3 of the last 4 digits of your CUNYFirst
Empl ID. If there are repeats, pick random numbers, so you are doing 3 different crosses.
2. Highlight the numbers of the crosses you are doing in column 1 below. You must pick 3
different crosses.
Cross
Number Male parent traits Female parent traits 0 Heterozygous for flower color
Heterozygous for height Homozygous dominant for flower color
Heterozygous for height 1 Heterozygous for flower color
Homozygous dominant for height Heterozygous for flower color
Homozygous dominant for height 2 Heterozygous for flower color
Heterozygous for seed color Heterozygous for flower color
Heterozygous for seed color 3 Homozygous recessive for flower color
Heterozygous for seed color Homozygous dominant for flower color
Heterozygous for seed color 4 Homozygous recessive for seed shape
Homozygous recessive for height Heterozygous for seed shape
Heterozygous for height 5 Heterozygous for seed shape
Heterozygous for height Heterozygous for seed shape
Homozygous recessive for height 6 Homozygous dominant for flower color Homozygous recessive for flower color
Homozygous recessive for seed shape
Homozygous dominant for seed shape 7 Heterozygous for flower color
Homozygous recessive for seed shape Heterozygous for flower color
Homozygous recessive for seed shape 8 Heterozygous for seed shape
Heterozygous for seed color Homozygous recessive for seed shape
Homozygous dominant for seed color 9 Heterozygous for seed shape
Homozygous recessive for seed color Homozygous recessive for seed shape
Homozygous recessive for seed color 1. Now you can use the charts and Punnett squares on each of the following pages to
complete your crosses. You can use the Lab 6 Handout: Sample Genetic Cross posted on
LaunchPad directly below the lab for a guide in doing these crosses
Cross 1: Please write the number of the cross you are performing: ______________
Then fill in the genotype and phenotype for each parent below. Use the sample of a genetic
cross posted on LaunchPad directly below the lab for a guide.
Sex Genotype Phenotype Male
Female Step 1: Determine the different gamete combinations that each parent can contribute to the
offspring. Check the hint from the sample problem when you are doing this. Sex
Male
Female Gamete 1 Gamete 2 Gamete 3 Gamete 4 Step 2: Fill in the Punnett Square below
Male gametes
place across Female Gametes:
Place below: ↓ Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.
Phenotype you’ve found in offspring Number of offspring with this phenotype Cross 2: Please write the number of the cross you are performing: ______________
Then fill in the genotype and phenotype for each parent below.
Sex Genotype Phenotype Male
Female Step 1: Determine the different gamete combinations that each parent can contribute to the
offspring.
Sex Gamete 1 Gamete 2 Male
Female Step 2: Fill in the Punnett Square below
Male gametes
place across Female Gametes:
Place below: ↓ Gamete 3 Gamete 4 Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.
Phenotype you’ve found in offspring Number of offspring with this phenotype Cross 3: Please write the number of the cross you are performing: ______________
Then fill in the genotype and phenotype for each parent below.
Sex Genotype Phenotype Male
Female Step 1: Determine the different gamete combinations that each parent can contribute to the
offspring.
Sex Gamete 1 Gamete 2 Male
Female Step 2: Fill in the Punnett Square below
Male gametes
place across Female Gametes:
Place below: ↓ Gamete 3 Gamete 4 Step 3: Find the Phenotype of each of the 16 combinations in your Punnett Square page.
Phenotype you’ve found in offspring Number of offspring with this phenotype Questions:
1. Are gametes haploid or diploid? What about the offspring, are they haploid or diploid?
(1pt) 2. Can two short and green seeded parents produce offspring that are tall and have yellow
seeds? Explain using a Punnett square why you think this outcome is possible or not. (1
pt) 3. Can two purple flowered and yellow seeded parents produce offspring that have white
flowers and green seeds? Explain using a Punnett square why you think this outcome is
possible or not. (1 pt)

 

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