Biology Genetics Test study for the test on Tuesday, Feb. 2

Define these genetics words:

Gene

Allele

Dominant

Recessive

Homozygous

Heterozygous

Hybrid

Pure bred

Genotype

Phenotype

Genetics

Incomplete Dominance (aka Co-dominance)

Multiple Alleles

Dihybrid

Phenotypic Ratio (or percentage)

Genotypic Ratio (or percentage)

Sex-linked traits

Sex chromosomes – X and Y- and determination of males and females

Carrier

Pedigree

Zygote

Know how to do the worksheet from Friday as well as ...

• Know how to do crosses (using Punnett Squares) like on Friday’s worksheet-- as in a dihybrid cross.) You will also need to understand and use a Punnett Square for determining traits with incomplete dominance.
• Know the five traits Mendel studied in peas and the dominant gene in each pair.
• How are multiple alleles different from polygenic inheritance? Which of the two involved more than one gene?
• Blood type is an example of both multiple alleles and incomplete dominance.
• Know the genotypes of each blood type and be able to predict blood types of offspring.
• Know examples of sex-linked traits, and why they are more common in males than in females.