1. Meiosis and Intro to Mendelian Genetics
Relay!

2. RELAY
Please get into (semi) even teams and line yourselves up in a single file line with your seats
Relay is easy! One student from each relay will go up against another student from the opposite relay to answer
Each student in the relay will most likely answer some part of the question posed.
Questions?

3. What are the ways that genetic variation is increased?
Crossing over
Random fertilization
Independent assortment of chromosomes
Independent: can line up chromosomes of blue blue and red red or blue red and blue red. Random: random of which sperm fertilizes the egg

4. What were Mendel’s four steps in his plant studies?
Started with true breeding
Cross pollinated
Offspring grew and traits were studied (F1)
These F1 self-pollinated to make F2

5. Fill in the blank
In his results, he found that the traits did not _________
Only one parent trait was shown, known as the ________________ trait
In generation one, we only saw the dominant trait. And in the _____ generation we saw the ____________ trait
Blend
Dominant
F2; recessive

6. List at least 5 explanations Mendel created after reviewing his data
Genes have particles
There are two genes in every individual
Genes can be the same or different
One trait can be masked by another
Genes segregate during reproduction
They combine at fertilization
Breeding between two heterozygous parents results in 3:1 ratio

7. Punnett time!
Suppose your yellow lab gets out one night. Some time later, you notice that she is pregnant with puppies. When the puppies are born, you perform a test cross to determine what the dad looked like.
Use the following when creating your Punnett square: bb- yellow labs, BB- black labs, and Bb-chocolate labs
You always test with a dominant allele, whether it be homozygous dominant or heterozygous

8. More Punnett square fun
You are a herpetologist and specialize in studying frogs. There are some characteristics you have noted about the frogs. They can be brown (dominant) or green (recessive), and they can have spots (dominant) or no spots (recessive). Draw a dihybrid Punnett square to display the options of offspring you can have if you cross a Homozygous dominant and homozygous recessive frog together.
Ratio 9:3:3:1