Inheritance with punnett square lab write up sample with
Explain how traits are passed on from parents to their offspring
Draw a punnett square
Compare and predict the phenotypes of offspring with given genotypes using punnett squares
Introduction: Inheritance is the transmission of genetic characteristics from parents to their offspring. This process occurs through the transfer of genetic material in the form of DNA from the parents to the offspring. In this lab, we will be using a punnett square to demonstrate how traits are passed down from parents to their offspring.
Materials:
- Punnett square worksheet
- Two different sets of genetic traits
Methods:
1. Choose two different sets of genetic traits (e.g. tall and short height)
2. Draw a punnett square by creating a grid with two boxes across the top and two boxes down the side.
3. Write one set of traits on the top of the grid and another set of traits on the side of the grid.
4. Fill in the boxes of the grid by combining the traits from the top with those on the side (i.e. crossing the traits).
5. Calculate the possible genotypes and phenotypes of the offspring based on the punnett square.
6. Compare the predicted phenotypes of the offspring with the given genotypes.
Results:
Example punnett square for height traits:
| Tall | Short
--|------|---------
T | TT | Tt
h | Tt | tt
In this example, if both parents were heterozygous (Tt) for the height trait, their offspring would have a 75% chance of being tall (TT or Tt genotype) and a 25% chance of being short (tt genotype).
Conclusion:
The use of a punnett square can help us better understand how traits are passed down from parents to their offspring. It allows us to predict the probability of certain genotypes and phenotypes in offspring based on the genetic traits of the parents. Inherited traits can be a combination of dominant and recessive genes, and their expression can be predicted using punnett squares.