CODOMINANCE

VACHS BIOLOGYCODOMINANCEDO NOW: FIRST TWO MINUTES, SILENTLY.1. GATHER MATERIALS: NotepacketBinder

2. WRITE DOWN HOMEWORK: Advanced Punnet Practice

3. TAKE OUT HOMEWORK: Sex-Linked Traits & PLAN practice

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Colorblindness is SEX-LINKED and RECESSIVE. If a colorblind male has a child with a colorblind woman, what percentage of their children will be male and colorblind? Human skin color is INCOMPLETELY DOMINANT. If a light skinned parent (ss) had a child with a dark skinned parent, what can you predict the heterozygous phenotype might be?

SO FAR WEVE LEARNED ABOUTCOMPLETE DOMINANCE

SEX-LINKED TRAITS

INCOMPLETE DOMINANCE

1. Codominance- Both traits or alleles share the dominance

- Both traits are expressed

Think: Co-champions share a championship. The same is true of codominance. Codominant traits are both dominant so both traits are present.Blood Type is a Codominant TraitThere are four types of blood that people have. What are they?Type A Type B Type AB Type O

Type AType BType ABType OBlood Cell StructureDraw these diagrams

Type AType BType ABType OWhat do you notice about the anitgens (surface proteins) of the different blood types? Each antigen or surface protein is unique and they do not mix. This is the reason only certain blood types can donated or accepted by other blood types.

Blood type also follows the rules of codominance.

Type A and B are codominant together and both are completely dominant to Type O.

5. FILL IN CHARTPhenotypeGenotypesType A__ OR__Type B__OR__Type AB___Type O___

PROBLEMS TO solve: Try theSE on YouR OWN: QUIETLY, STAY SEATED.In blood type A and B are codominant to O. If a heterozygous type B mother mates with a homozygous type A father, what % of offspring will have type O blood?

2) In blood type A and B are codominant to O. If a type O mother mates with a homozygous type B father, what % of offspring will have type B blood?

NEW VOCAB WORD FOR OUR GLOSSARY:TRANSFUSION:When someone takes the blood of another person.

BLOOD TRANSFUSIONS ACTIVITYC: restaurant voicesH: Reference your instructions, ask your team mates, then ask me!A: You will be doing a blood transfusion simulation lab in which you will determine which blood types are safe for transfusions! M: walking to retrieve materials, sitting down while working.P: Performing the lab activity and helping your partners. S: Determining a hypothesis and collecting evidence to support or disprove it! Filling out all of the lab questions. PUNNET PRACTICE: GRAPHIC ORGANIZER!

First box:COMPLETE DOMINANCE:One dominant allele MASKS (covers up) the other.

EXAMPLE: Brown fur is dominant, white is recessive. Offspring are mostly brown, with some white.

INCOMPLETE DOMINANCETwo traits mix together.

Example:Crossing one red flower and one white flower willproduce pink offspring.

CODOMINANCEBoth traits are expressed.

Example: The AB blood type is a combination of both A and B.

SEX-LINKED TRAITSTraits are linked to the X-chromosome.

QUIZ NEXT CLASS!The quiz next class will have FOUR questions:Incomplete dominance crossSex-linked crossCodominant crossDihybrid cross

C: restaurant voicesH: ask the people next to you, raise your hand to ask questions.A: practicing advanced punnet squares using the problems at the end of your note packet!M: sitting still, UNLESS you have finished and I have checked your answers. Then you can walk around to help people.P: working independently on practice problems.S: Identifying exactly what questions you need help on, getting that help and completing the problems correctly so you can ACE THE QUIZ NEXT WEEK, LIKE A BOSS!!!!** TURN IN LABS BEFORE YOU LEAVE!