Download 9 Genetics Mendel

Mendel and the Gene Idea
1. Name two or three of the characteristics used in his legendary experiments. What plant did he
use?
2. Describe the difference between dominant and recessive genes, between homozygous,
heterozygous, and hemizygous gene combinations, and between genotype and phenotype.
3. What is an allele? How many alleles are possible per characteristic, according to Mendel?
How many genes are carried per cell for a particular characteristic, according to Mendel? Where
are these genes carried?
4. Show how to write the genes present in the gametes arising from a one factor cross, like Pp x
Pp. Show how to make a Punnett Square and figure out the genotypic vs phenotypic ratios if P=
purple and p= white.
5. Show how to write the genes present in the gametes arising from a two factor cross, like YsYs
x YsYs, where Y= yellow, y= green, S= smooth, s= prickly. Show how to make the Punnett
Square and calculate the genotypic and phenotypic ratios. How can the binomial solving
algorithm known as F.O.I.L. help you here?
6. Be able to solve any problem similar to those on the practice set assigned to you for
homework. Try the practice problems in this review section and those in your book.
Bios 140 Study Guide
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