2.12.25 Lesson
Presentation
•
Biology
•
9th - 12th Grade
•
Practice Problem
•
Hard
Standards-aligned
Krista Marshall
FREE Resource
7 Slides • 8 Questions
1
Punnett Squares
Completing this quizizz will earn you 10 extra points on your Genetics and Punnett Squares assignment for this week!
2
Match
In rabbits, gray fur is dominant (G) to white fur (g), and black eyes are dominant (B) to red eyes (b). What are the phenotypes of rabbits that have the following genotypes? What is the genotype for fur color and eye color for the bunny pictured?
GG or Gg
gg
BB or Bb
bb
Gray fur
White fur
Black eyes
Red eyes
gg and bb
Gray fur
White fur
Black eyes
Red eyes
gg and bb
3
Match
Match the following terms to their definitions
Dominant Trait
Recessive Trait
Homozygous
Heterozygous
Gene
A trait that will show if it is in genes
A trait that is "hidden" by a dominant
A genotype with two of the same alleles
A genotype with two different alleles
A portion of DNA that carries a trait
A trait that will show if it is in genes
A trait that is "hidden" by a dominant
A genotype with two of the same alleles
A genotype with two different alleles
A portion of DNA that carries a trait
4
5
Labelling
Label the parts of the Punnett Square
Recessive Trait
Dominant Trait
Homozygous Recessive Offspring (50%)
Heterozygous Offspring (50%)
Homozygous Recessive Parent
Heterozygous Parent
6
Probability
Ratios vs. Percentages
A percentage is a number that shows how often out of 100 possible outcomes an event occurs. For example, if you flip a coin 100 times, because there are only 2 possibilities (heads or tails) there's a 50% probability that it will land on either heads or tails (50 times out of 100).
A ratio represents the numbers of a probability. For example, in flipping a coin, you can get heads 1 out of 2 times or tails 1 out of 2 times for a ratio of 1:1.
7
Probability in Punnett Squares
In a Punnett Square, each individual square represents a 25% chance or a 1 out of 4 chance that an offspring will have the genotype.
8
Probability in Punnett Squares
Genotypic Ratio: Ratio of Genotypes of the offspring.
Phenotypic Ratio: Ratio of Phenotypes of the offspring.
For this example, our genotypic ratio would be:
1/4 Homozygous Dominant,
2/4 Heterozygous, and
1/4 Homozygous Recessive or 1:2:1
The phenotypic ratio is
3/4 Black Fur and
1/4 White Fur or 3:1
9
Dropdown
10
Multiple Choice
11
Multiple Choice
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any white-flowering plant resulting from this species?
rr
rR
RR
Rr
12
Multiple Choice
How many alleles (letters) does a child get from EACH parent for each trait?
1
2
3
4
13
Independent Practice Time
Directions
The next slide will take you to the "clickable links" tab. Complete the activities there and then come back to the quizizz and complete the exit ticket question!
If you have questions, ask the sub or email me!
14
2.12 You Do - Google Slides
You can open this webpage in a new tab.
15
Multiple Choice
In corn, smooth kernels (K) are dominant to wrinkled kernels (k). A farmer crosses two corn plants that are heterozygous for kernel texture. What percentage of the offspring will have smooth kernels?
***Hint: Do a Punnett Square!***
0%
25%
75%
100%
Punnett Squares
Completing this quizizz will earn you 10 extra points on your Genetics and Punnett Squares assignment for this week!
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