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1/18/13 Bell Ringer
O What is the equation for photosynthesis?
O What is the equation for cellular respiration?
Objective: To review for the final exam
Agenda
O Study guide questions?
O Punnett square practice
O Meiosis
Punnett SquaresStepsO In dogs, erect
ears (E) is dominate over droopy ears (e). What are the results if two heterozygous dogs have a litter of puppies.
O 1. Create a KEYO Dominant, recessiveO Heterozygous
(different)O Homozygous (same)
O 2. Figure out what the parents are
O 3. Create a punnett square
O 4. Solve
Punnett SquaresStepsO Sully is from a species
called Blutons. Most Blutons either have short horns or long horns. Short horns are dominant (H) and long horns are recessive (h).
O If a female Bluton with long horns has a child with a male Bluton with heterozygous short horns, what are the chances that their offspring will have long horns?
O 1. Create a KEYO Dominant, recessiveO Heterozygous
(different)O Homozygous (same)
O 2. Figure out what the parents are
O 3. Create a punnett square
O 4. Solve
StepsO Buzz Lightyear’s cleft chin (chin dimple) is a dominant trait. Jessie does not have a cleft chin. Buzz’s cleft chin is homozygous (he is purebred).
O What is the probability of their offspring inheriting and not inheriting a cleft chin?
O 1. Create a KEYO Dominant, recessiveO Heterozygous
(different)O Homozygous (same)
O 2. Figure out what the parents are
O 3. Create a punnett square
O 4. Solve
O The ability to roll the tongue (R) is determined by a dominant gene while the recessive gene results in the inability to roll the tongue (r).
O A man and his wife can both roll their tongues and are surprised to find that their son cannot.
O Explain this by showing the genotypes of all three persons. (Note: you do not need to do a Punnett Square for this problem).
Co-DominanceStepsO In crocus flowers,
white (Fw) and purple (FP) colors are co-dominant, and result in a purple and white striped flower when both genes are present. What are the possible results from the cross-pollination of a striped crocus with a white crocus?
O 1. Create a KEYO Dominant, recessiveO Heterozygous
(different)O Homozygous (same)
O 2. Figure out what the parents are
O 3. Create a punnett square
O 4. Solve
O Your dog has straight hair (H). He is a homozygous for straight hair. Your friend’s dog has curly hair (h) and is homozygous. Straight hair is dominant and curly is recessive. They have a puppy, will it have curly or straight hair. What is the possibility of each?
