Review
Do you know the answers to these questions, as well as the skills?
What does it mean for someone to be homozygous or heterozygous?
What does it mean for someone to be homozygous or heterozygous?
How do you know whether to use one letter in the key (uppercase and lowercase) or use two different letters (both uppercase)?
How do you know whether to use one letter in the key (uppercase and lowercase) or use two different letters (both uppercase)?
How are simple (complete) dominance, incomplete dominance, and co-dominance different in the phenotype of the heterozygous offspring? For example, if you have one red parent and one white parent, the offspring will look different with each type of dominance. For one, it's red, for another, it's pink, and for the third, it's red and white.
How are simple (complete) dominance, incomplete dominance, and co-dominance different in the phenotype of the heterozygous offspring? For example, if you have one red parent and one white parent, the offspring will look different with each type of dominance. For one, it's red, for another, it's pink, and for the third, it's red and white.
Be sure you can complete all five types of genetics problems, including simple dominance, incomplete dominance, codominance, sex-linked traits, and dihybrid crosses.
Be sure you can complete all five types of genetics problems, including simple dominance, incomplete dominance, codominance, sex-linked traits, and dihybrid crosses.
When completing a genetics problem, do the following, in this order.
When completing a genetics problem, do the following, in this order.
Type: Decide which type of problem it is. Is is simple dominance with one dominant trait and one recessive? Is it incomplete dominance? Is it codominance? Is it a sex-linked, or x-linked, trait? Is it a dihybrid cross?
Type: Decide which type of problem it is. Is is simple dominance with one dominant trait and one recessive? Is it incomplete dominance? Is it codominance? Is it a sex-linked, or x-linked, trait? Is it a dihybrid cross?
#: How many dominant traits are there? With one dominant trait, you use one letter in the key (upper and lowercase). With two dominant traits, you use two capital letters in the key. Dihybrid crosses use two letters because we are looking at two traits at once, but they are simple dominance, so you use an upper and lowercase letter for each trait.
#: How many dominant traits are there? With one dominant trait, you use one letter in the key (upper and lowercase). With two dominant traits, you use two capital letters in the key. Dihybrid crosses use two letters because we are looking at two traits at once, but they are simple dominance, so you use an upper and lowercase letter for each trait.
Key: Set up your key. It has three parts. Homozygous dominant (ex. HH), homozygous recessive, or the other dominant trait (ex. hh or WW), and heterozygous (ex. Hh or HW).
Key: Set up your key. It has three parts. Homozygous dominant (ex. HH), homozygous recessive, or the other dominant trait (ex. hh or WW), and heterozygous (ex. Hh or HW).
Cross: Write your cross. Look for the sentence that says to cross, mate, marry, or tells you about the father and mother. This sentence tells you the genotypes of the parents. Write them in the space for your cross (______ x ______) before completing the Punnett square.
Cross: Write your cross. Look for the sentence that says to cross, mate, marry, or tells you about the father and mother. This sentence tells you the genotypes of the parents. Write them in the space for your cross (______ x ______) before completing the Punnett square.
Ask me for the answer key to be sure your work is correct.
Ask me for the answer key to be sure your work is correct.