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Warm-Up Predicting Heredity
Lesson Goals
Discover how can be predicted.
Determine theprobability of
combinations using aPunnett square.
Identify the
an organism based on itsgenotype.
of Define probability anduse it to explain theresults of a geneticcross.
Words to Know
Fill in this table as you work through the lesson. You may also use the glossary to help you.
the likelihood that a given event will occur
the possible genotypes that can result from the mating of two individuals
a part of a whole
to guess based on observations, prior knowledge, or reasoning
a diagram used to predict all possible allele combinations from a genetic cross
Lesson Question
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WK2
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Warm-Up Predicting Heredity
Genotype and Phenotype
The genotype is an organism’s combination.
The phenotype is the physical appearance or characteristics seen in an
.
Genotype: YY
(homozygous
)
Phenotype: Yellow
Genotype: Yy
(heterozygous)
Phenotype:
Genotype: yy
(homozygous
)
Phenotype:
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Probability
• Probability is the that a
given event will occur.
• Red apple: 18
• Green apple: 28
• Tangerine:
• Pear: 1
8
Probability Using Percentages
Probability can also be expressed using a . 25 + 25 + 25 + 25 = 100
Fraction: 14
Percentage: 25%
25% 25%
25% 25%
Fraction:
Percentage: 50%
25% 25%
25% 25%
25 + 25 =
Fraction: 34
Percentage: 75%
25% 25%
25% 25%
25 + 25 + 25 = 75%
Fraction: 44
Percentage: 100%
25% 25%
25% 25%
25 + 25 + 25 + 25 = 100%
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Genetic Cross
A is the possible
genotypes that can result from the mating of two individuals.
Genotype of for
seed color
YY ×
First-generation offspring
Punnett Squares
A Punnett square is a diagram used
to predict all possible
combinations from a genetic cross.
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Predicting HeredityInstruction
Punnett Squares
A Punnett square shows a genetic .
YY x yy
Probability of Genotypes
• The probability of each genotype
• YY −
• Yy − 50%
• yy −
25 + 50 + 25 = 100%
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Probability of Phenotype
• The probability of each phenotype
• Yellow −
• Green −
75 + 25 = 100%
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Genotype and Phenotype
• Homozygous dominant genotypes will show the dominant trait.
• YY = seeds
• Heterozygous genotypes will show the
trait.
• Yy = yellow seeds
• Homozygous recessive genotypes will show the trait.
• yy = seeds
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Summary Predicting Heredity
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Answer
Review: Key Concepts
• A Punnett square is a used to
predict all possible allele combinations from a genetic cross.
• Phenotypes of can be
determined from the genotypes in a Punnett square.
• The of genotypes and
phenotypes can be determined using a Punnett square.
Lesson Question How can traits be predicted?
2Slide
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