I am lost in this Genetics Maze. Here is my assignment:
Write out a cross using genotypes as parents
Determine Possible Gametes that may be formed
Use a Punett Square to establish the genotypes of all possible progeny.
Determine the Genotype Ratio of the progeny. Count the number of identical genotypes and express them as a ratio of the total genotypes
Use the info below to determine the phenotype ratio from the genotype ratio:
Characteristics:
Flower Color
Seed Color
Seed Shape
Plant Height
Dominant Gene:
Purple Flowers, PP or Pp
Yellow seeds, YY or Yy
Round seeds, RR or Rr
Tall plants, TT or Tt
Recessive Gene:
White flowers, pp
Green seeds, yy
Wrinkled seeds, rr
Dwarf plants, tt
OK, Im lost, do I just make one separate punett square for each trait (ending up with 4 punett squares) or do I put all them on one big square? Professor wants us to complete the F1 generation.
I sure would appreciate some help. I am a non-tradtional college student and have never had biology, havent been in school since 1983. I need this by tomorrow would appreciate some guidance
I'm happy to help you with this genetics assignment! Let's break down the steps to complete the F1 generation.
1. Write out a cross using genotypes as parents:
To start, you need to identify the genotypes of the parents. Let's assume the parents have the following genotypes:
Parent 1: PPYYRRTT (purple flowers, yellow seeds, round seeds, tall plants)
Parent 2: ppyyrrtt (white flowers, green seeds, wrinkled seeds, dwarf plants)
2. Determine the Possible Gametes that may be formed:
In order to determine the possible gametes, you need to separate the alleles (genetic factors) of each parent. The possible gametes for each parent are as follows:
For Parent 1: PYRT
For Parent 2: pyrt
3. Use a Punnett Square to establish the genotypes of all possible progeny:
Now, it's time to create a Punnett Square to determine the potential genotypes of the offspring. Since you have four different characteristics (flower color, seed color, seed shape, and plant height), you will need to create separate Punnett Squares for each characteristic. In total, you'll need four separate Punnett Squares.
For example, if we create a Punnett Square for flower color, it would look like this:
| P | p |
------------------------
P | PP | Pp |
------------------------
p | Pp | pp |
You'll need to repeat this for seed color, seed shape, and plant height, creating a separate Punnett Square for each characteristic.
4. Determine the Genotype Ratio of the progeny:
Now that you have filled in all the Punnett Squares, count the number of each genotype. For example, count the number of PP, Pp, and pp genotypes in the flower color Punnett Square. Repeat this for each Punnett Square. Once you have the counts, express the number of identical genotypes as a ratio of the total genotypes. For example, if you have 2 PP, 1 Pp, and 1 pp genotype, the ratio would be 2:1:1.
5. Determine the Phenotype Ratio from the Genotype Ratio:
To determine the phenotype ratio, you need to refer back to the dominant and recessive characteristics mentioned in the assignment. Each dominant allele will express the dominant trait, while a recessive allele will express the recessive trait. For example, in the flower color Punnett Square, PP and Pp genotypes will express the dominant trait of purple flowers, while pp will express the recessive trait of white flowers. Count the number of each phenotype and express them as a ratio.
Remember to follow these steps for each of the characteristics (flower color, seed color, seed shape, and plant height) separately.
I hope this helps you complete your assignment! Let me know if you have any further questions.