Meiosis and Intro to Mendelian Genetics Relay!

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?

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

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

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

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

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

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