Bell Work
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Transcript of Bell Work
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Bell Work
• A tan cat mates with a black cat. Tan is co-dominant with black fur in cats. What is the genotype and phenotype of the offspring?
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Biology – Lecture 50
Intro to Double Punnett Squares (Dihybrid crosses)
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Making a Double Punnett Square
• Step 1: Decide which possible allele combinations can be passed from each parent to the offspring.
• Step 2: Take those 4 allele combinations and set them at the top (parent 1) and sides (parent 2) of the double punnett square.
• Step 3: Cross the allele combinations in the punnett square to get the possible genotypes of the children.
• Step 4: Determine the phenotype of each gene trait for the children.
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Mendel’s Second Law
• In sexually reproducing organisms, genes generally assort independently of each other.
• This means that the alleles of different genes get shuffled between parents to form offspring with many different combinations.
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TODAY
• Step 1: Decide which possible allele combinations can be passed from each parent to the offspring.
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How to Determine Possible Allele Combinations
• Step 1: Give each allele from each gene combination the numbers 1 and 2.
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• Step 2: Match #1 from the first gene with #1 from the second gene. This is your first allele combination.
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• Step 3: Match #1 from the first gene with #2 from the second gene. This is your second allele combination.
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• Step 4: Match #2 from the first gene with #1 from the second gene. This is your third allele combination.
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• Step 5: Match #2 from the first gene with #2 from the second gene. This is your first allele combination.
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Example 1
• What are the possible allele combinations from a parent that is SsYy?
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Practice 1
• What are the possible allele combinations from a father who is AahH?
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Practice 2
• What are the possible allele combinations from a mother who is KkZZ?
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Applying Knowledge
• Use your knowledge of heterozygous, homozygous recessive, and homozygous dominant to determine the genotype of the parent and the 4 different allele combinations of the offspring.
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Example 1
• What are the possible allele combinations that can be made from a mother who is homozygous short (tall is dominant) and has homozygous brown eyes (blue eyes is recessive)?
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Practice 1
• A mother is heterozygous tall (tall is dominant), and has blue eyes (brown eyes are dominant). What are the possible alleles she can pass on to her children?
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Practice 2
• Determine the allele combination that can come from a father who is heterozygous brown eyed and homozygous black haired (blonde is recessive).
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Practice 3
• Determine the allele combination from a dog who is droopy eared (erect ears are dominant) and brown and white spotted (brown and white are co-dominant).
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Practice 4
• Determine the allele combination from a mouse who is heterozygous for having whiskers (no whiskers is recessive) and grey (white and black are incompletely dominant).
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Pop Quiz
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Pop Quiz
• What are the 4 allele combinations that can come from the following genotype of a mother?
• BbTt