Weird True & Freaky: Animal Planet Today’s Schedule

1. Video of the Day 2. Probability & Genetics

3. Assignment

You are going to flip your coin 20 times. Predict how many times the coin will be “heads

up” and “tails up” Record the results of each flip. Probability- the likelihood that a particular

event will occur.

What is the probability that a coin tossed 1 time will land “heads up”?

The probability would be: 1 in 2 or 50% What is the probability that a coin tossed 20

times will land “heads up”? We would expect it to be 10 in 20 or 50% But, this is not always the case. We might have

12 in 20, 15 in 20, or maybe 7 in 20.

Mendel recognized that the principles of probability could be used to predict the results of genetic crosses.

What is the probability that the hybrid pea plants would be tall?

3 in 4 or 75%

How do we predict genetics? Punnet Square- a chart that

shows all the possible combinations of alleles that can result from a genetic cross.

Punnet Squares help scientists predict the outcome of a genetic cross.

Phenotype- an organisms physical appearance, or its visible traits

Genotype- an organisms genetic makeup or allele combinations

Homozygous- an organism that has two identical alleles for a trait. (homo = same)

Heterozygous- an organism that has two different alleles for a trait (hetero = different)

What happens when two organisms reproduce and there is not a dominant or recessive allele?

Both alleles will be expressed in the offspring. Codominance- neither allele is dominant or

recessive

Punnett Squares Drag-and-Drop Genetics: Monohybrid Punnetsquares punnet square interactive

Make the Right Call Skills Lab

Making predictions is an important part of science. An accurate prediction can be a sign that you understand the event you are studying. In this lab you will make predictions as you model the events involved in genetic crosses.

Problem: How can you predict the possible results of genetic crosses?

Materials: 2 Paper Bags, 2 red beans and 2 white beans

Data Table 1Trial Allele From Bag 1

(Female Parent)Allele From Bag 2(Male Parent)

Offspring’s Alleles

1

2

3

4

5

6

Analyze & Conclude Punnet Squares