Question

Heredity Lab Report

Instructions: In the Heredity lab, you investigated how hamsters inherit traits from their parents. Record your observations in the lab report below. You will submit your completed report.
________________________________________
Hypothesis:
In this section, please include the if/then statements you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Test One: If I breed a short fur, FF female with a short fur, Ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.
Test Two: If I breed a short fur, Ff female with a short fur, Ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.
Test Three: If I breed a long fur, ff female with a long fur, ff male, then I will expect to see (all short fur; some short and some long fur; all long fur) offspring.

Procedure:
The procedures are listed in your virtual lab. You do not need to repeat them here. Please be sure to identify the test variable (independent variable) and the outcome variable (dependent variable) for this investigation.
Remember, the test variable is what is changing in this investigation. The outcome variable is what you are measuring in this investigation.
Test variable (independent variable):
Outcome variable (dependent variable):

Data:
Record the data from each trial in the data chart below. Be sure to fill in the chart completely.
Test One
Parent 1: FF
Parent 2: Ff




Phenotype ratio:
________ : ________
short fur : long fur


Test Two
Parent 1: Ff
Parent 2: Ff




Phenotype ratio:
________ : ________
short fur : long fur


Test Three
Parent 1: ff
Parent 2: ff




Phenotype ratio:
________ : ________
short fur : long fur

Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please write in complete sentences.
1. Which genotype(s) and phenotype for fur length are dominant?
2. Which genotype(s) and phenotype for fur length are recessive?
3. If you have a hamster with short fur, what possible genotypes could the hamster have?
4. If you have a hamster with long fur, what possible genotypes could the hamster have?
5. Did your data support your hypotheses? Use evidence to support your answer for each test.
o Test One:
o Test Two:
o Test Three:
6. Which hamsters are the parents of the mystery hamster? Include evidence to prove that they are the correct parents.

Answer 1

Hypothesis: Test One: If I breed a short fur, FF female with a short fur, Ff male, then I will expect to see all short fur offspring. Test Two: If I breed a short fur, Ff female with a short fur, Ff male, then I will expect to see some short and some long fur offspring. Test Three: If I breed a long fur, ff female with a long fur, ff male, then I will expect to see all long fur offspring.

Procedure: Test variable (independent variable): The fur length genotype of the parents. Outcome variable (dependent variable): The fur length phenotype of the offspring.

Data: Test One Parent 1: FF Parent 2: Ff

Phenotype ratio: 4 : 0 short fur : long fur

Test Two Parent 1: Ff Parent 2: Ff

Phenotype ratio: 3 : 1 3 short fur : 1 long fur

Test Three Parent 1: ff Parent 2: ff

Phenotype ratio: 4 : 0 long fur : short fur

Conclusion:

The genotype and phenotype for short fur are dominant.

The genotype and phenotype for long fur are recessive.

If you have a hamster with short fur, the possible genotypes are FF or Ff.

If you have a hamster with long fur, the genotype must be ff.

The data supported the hypotheses:

Test One: The offspring all had short fur, supporting the hypothesis that short fur is dominant.

Test Two: The offspring had a ratio of 3 short fur : 1 long fur, supporting the hypothesis that some offspring will have long fur when both parents have the heterozygous Ff genotype.

Test Three: The offspring all had long fur, supporting the hypothesis that long fur is recessive.

The parents of the mystery hamster must have both had the heterozygous Ff genotype for short fur length. The mystery hamster had short fur, which is the dominant phenotype, and could have inherited an F allele from both parents, making its genotype either FF or Ff. The evidence for this conclusion is that only the parents with the Ff genotype could produce offspring with short fur in Test Two, and the mystery hamster has short fur.