Biology A Dihybrid Cross Lab Activity

to show the chances that certain traits will appear in offspring

What is the purpose of this investigation?

Punnett Square and math

How is the number of EXPECTED offspring determined

offspring are produced by chance and may not agree exactly with expected results

How exact are the expected results?

by chance and the outcomes of the cross close to

How is the number of observed offspring in a genetic cross determined?

not always exactly accurate

how exact are the expected results?

the expected offspring and compare it to observed offspring obtained through coin tossing. You also use a Punnett Square to shoe the chances that certain traits will appear in offspring

How does Part A support your understanding pf genetics?

There is one homozygous trait in Part A that is not in Part B

Why is the total; pf observed and expected offspring in Part A different from the totals of observed and expected offspring in Part B?

there wouldn't be as wide of a range to get expected results

How would the observed offspring compare if only 16 coin tosses were used instead of 96?

You have a better chance of matching up with the exact expected amount

Why is it better to use large numbers of offspring when attempting to prove that genetic totals of expected results do not agree with observed results

The Punnett Square shoes gametes and possible offspring and are shaded according to phenotype

How does Part B support our understanding of genetics

they have an equal amount of parents and traits to determine offspring

What is the advantage of tossing and reading properly marked coins over using living organisms?

Is the comparison between coins and living organisms correct and why?

in Part A, there are three heterozygous and one homozygous traits. In Part B, they are all heterozygous. That one trait will make a difference when trying to compare offspring

Explain why the results in Table 3 are not the same as in Part A or B of this experiment.