Bell Work 2/9/2015
In pea plants, round seeds (R) are dominant over wrinked seed (r). The Punnett
square below sets up a cross between two parents that are heterozygous for
round peas.
Describe all possible phenotypes and genotypes for this cross.
Agenda
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Bell Work
Word Wall: Word of the Day
Heredity/ Punnett Square BrainPop
Punnett Square Challenge, Part 2
Celebrity Genetics Work Time
Exit Ticket
Word Wall: Word of the Day
kinetic: relating to the movement of physical
objects
Group #1 Challenge
In dogs, wire hair (W) is dominant to
smooth (w). What is the percentage
in a cross of a homozygous wirehaired dog with a smooth-haired
dog?
Group #2 Challenge
In rabbits, black fur is dominant to
white fur. What are the
percentages for a homozygous
black rabbit and a homozygous
white rabbit?
Group #3 Challenge
In pea plants, spherical seeds
(S) are dominant to dented
seeds (s). In a genetic cross of
two plants that are
heterozygous for seed shape,
what ratio of the offspring
should have spherical seeds?
Group #4 Challenge
In fruit flies, red eyes are dominant
to white eyes. What is the
percentage for heterozygous fruit
fly with a homozygous recessive
fruit fly?
Group #5 Challenge
In humans, pointed eyebrows are
dominant over smooth eyebrows.
What is the ratio for a homozygous
woman with pointed eyebrows and
a man with smooth eyebrows?
Group #6 Challenge
In guinea pigs, smooth coat
(S) is dominant over rough
coat (s) and black coat (B) is
dominant over white coat (b).
What is the ratio for 2 rough
coated guinea pigs?
Group #7 Challenge
In tomatoes, red fruit (R) is
dominant over yellow fruit.
What will be the percentage
of homozygous yellow
tomato and a heterozygous
tomato?
Group #8 Challenge
Shaggy hair in dogs is dominant
to its recessive allele, short
hair. What is the percentage of
2 heterozygous dogs?
Genetics Project
• Directions:
• 1. You will need to choose one female and one male celebrity.
• 2. For each celebrity, you need to record the phenotype for the traits listed and pick a
genotype. (For example, if Justin Bieber has blonde hair, the genotype would be “bb”. If
Selena Gomez has brown hair, her genotype would be either “Bb” or “BB”.)
• 3. Create a Punnett square to express the possible offspring outcomes.
• 4. Record the trait the offspring will MOST LIKELY inherit.
• 5. Draw a picture depicting what the offspring should look like based on inherited traits.
Exit Ticket
Create your own monohybrid Punnett Square cross word
problem.
Use the examples in your notes for ideas.