introduction. used to predict the possible outcomes that may result from the mating process between...
TRANSCRIPT
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Punnett SquaresIntroduction
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What is it used for?
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Used to predict the possible outcomes that may result from the mating process between two individuals
What is it used for?
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Using the Create-A-Kid activity
Example:
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Using the Create-A-Kid activity◦ What did the letters you flipped for represent?
Example:
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Using the Create-A-Kid activity◦ What was different about the way genes were
inherited in the activity done in class versus real life inheritance?
◦ Hint**- Do you know which alleles you will receive from your parents?
Example:
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How many alleles do your parents have for each trait?
Inheritance
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How many alleles do your parents have for each trait?◦ TWO (or more)!!
◦ SO, how do you know which one you will get?
Inheritance
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How many alleles do your parents have for each trait?◦ TWO (or more)!!
◦ SO, how do you know which one you will get?
◦ YOU DON’T!! You can only predict POSSIBLE outcomes
Inheritance
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WHY??
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Law of Segregation Law of Independent Assortment
Mendel’s Laws
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States that every individual possesses a pair of alleles for every trait and that each parent passes a RANDOM copy of only ONE of these to its offspring
Allele pairs SEPERATE during gamete formation
RANDOMLY unite at fertilization One (RANDOM) allele from each parent
Law of Segregation
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States that separate genes for separate traits are passed independently of one another from parents to offspring
Meaning- Traits are independent of another◦ Just because you get brown eyes does NOT mean
you will get brown hair
Law of Independent Assortment
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Example: Earlobe shape
Attached= Dominant (E)◦ Possible genotypes?
Hanging free= homozygous Recessive (e)
How do you set a punnett square up?
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Example: Earlobes Attached= Dominant (E) Hanging free= homozygous Recessive (e)
1. What is the mothers genotype?
How do you set a punnett square up?
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Example: Earlobes Attached= Dominant (E) Hanging free= homozygous Recessive (e)
1. What is the mothers genotype? 2. What is the fathers genotype?
How do you set a punnett square up?
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Example: Earlobes Attached= Dominant (E) Hanging free= homozygous Recessive (e)
1. What is the mothers genotype? 2. What is the fathers genotype? 3. Write combination in squares
How do you set a punnett square up?
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If the mother has attached ear lobes and the father has earlobes that hang free, what kind of earlobes will their child have?
Poll◦ Text 376-06
Predict!!!
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Punnett Square Set Up•Each cell within the square is representative of one possible genotypic outcome for any offspring
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In purple people eaters, one-horn is dominant (P) and no horns is recessive (p). Draw a Punnet Square showing the cross of a purple people eater that is heterozygous for horns with a purple people eater that does not have horns. Summarize the genotypes & phenotypes of the possible offspring.
White boards
Practice Problem
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In garden peas, round seed coats (R) is dominant over wrinkled seed coats (r). What will the results be of a cross between a homozygous dominant male and a recessive female.
White boards
Practice Problem
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One cat carries heterozygous, long-haired traits (Ss), and its mate carries homozygous short-haired traits (ss). Use a Punnett square to determine the probability of one of their offspring having long hair.
What is the probability of one of their offspring having long hair?
Practice Problem
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Write your own genetics problem that can be solved using a Punnett square. When finished, raise your hand to show me and we will switch with another student.
Write your own!!