Punnett Square Notes & Sheep & Peas Pd2
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Transcript of Punnett Square Notes & Sheep & Peas Pd2
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DQ 3-1-10
• What is a genotype?
• What is a phenotype?
• How many alleles for each gene does an organism have?
Turn in Spot the Dog worksheet, if not already turned in!
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Punnett Squares
Practice
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In guinea pigs, black is dominant
Cross a homozygous dominant with a heterozygous guinea pig.
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In guinea pigs, black is dominant
Cross a homozygous recessive with a heterozygous.
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In guinea pigs, black is dominant
Cross two heterozygous guinea pigs.
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A codominant crossIn cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan.
Cross homozygous white with a homozygous red.
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A codominant crossIn cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan.
Cross two heterozygous roans.
![Page 17: Punnett Square Notes & Sheep & Peas Pd2](https://reader035.fdocuments.net/reader035/viewer/2022062616/54994616b47959ce398b457a/html5/thumbnails/17.jpg)
A codominant crossIn cattle, red hair and white hair are codominant – they will both show up if the cow is heterozygous. This mixed color is called roan.
Cross a homozygous dominant with a heterozygous roan.