Day+36+-+Punnett+Square+Review

Daily Agenda: 1. Genetics With a Smile - 60 minutes 2. Punnett Square Hoop Shoot & Review - 30 minutes

3.03 Interpret and predict patterns of inheritance. • Dominant, recessive and intermediate traits. • Multiple alleles. • Polygenic inheritance. • Sex-linked traits. • Independent assortment. • Test cross. • Pedigrees. • Punnett squares.

Review for Quiz:

Regular Punnett Squares Codominance Incomplete Dominance Multiple Alleles Sex-linked Traits
 * One allele is dominant over another allele (which is called recessive).
 * Homozygous means that they have 2 of the same allele (either BB or bb) and heterozygous means that they have 2 different alleles (Bb).
 * The genotype is the genes of the individual - LETTERS
 * The phenotype is the description of the individual - WORDS
 * Both alleles are dominant - so we use all capital letters!!
 * A heterozygote will express both alleles equally and will be striped, spotted, speckled, etc.
 * Example: In witches green and orange are both dominant eye colors. A green eyed witch has the genotype GG, an orange eyed witch has the genotype OO. A witch with a genotype GO would have one green eye and one orange eye.
 * One allele is more dominant than the other one.
 * A heterozygote will blend the two alleles together.
 * Example: In rats, black fur is incompletely dominant over white fur. A black rat has the genotype BB, a white rat has the genotype WW. A rat with the genotype BW would be gray.
 * There are more than 2 alleles for the trait.
 * We discussed human blood types where A and B are codominant over O.
 * Type A blood can have the genotypes AA or AO.
 * Type B blood can have the genotypes BB or BO
 * Type AB blood has the genotype AB
 * Type O blood has the genotype OO
 * Sex-linked traits are carried on the X chromosome.
 * Remember that females are XX and males are XY.
 * A female that is heterozygous for the trait is said to be a carrier. Males cannot be carriers because they only possess one X chromosome and therefore either have the disease or are "normal".