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7th Gr Genetics

What did Gregor Mendel do? He studied genetics by CROSS POLLINATING PEA PLANTS
What do we call factors that control traits? GENES!
If an organism has 2 different alleles for a trait we call that individual a hybrid (or we say heterozygous)
What does TT mean? Two capital letters means 2 DOMINANT alleles
What does Tt mean? One dominant allele and one recessive allele
What does a Punnett Square show? The possible outcomes of a genetic cross
What is a phenotype? An organisms physical appearance. (In other words....it is what we can see)
What does CODOMINANCE mean? Neither allele is dominant. They both show up.
What do we call different forms of a gene? ALLELES
What is a genotype? Its actual genetic make-up. (It's 2 letters)
If an organism has 2 identical alleles for a trait we call it Homozygous or purebred
What is a pedigree chart used for? Tracking a particular trait through multiple generations of a family
Which human genetic disorder results in abnormally shaped blood cells? Sickle-cell disease
In a pedigree, what does a circle represent? a female
In a pedigree, what does a square represent? a male
What does a blackened circle represent? A female who has the trait
What does a blackened square represent? A male who has the trait
How is a carrier female shown? The circle is only half blackened.
Remember to practice your Punnett squares!! The test has a dominant/recessive, an incomplete dominance, and a codominance Punnett square!
Created by: cwalczak