Punnett Squares and Inheritance

Week 17-Life Science

Day 1

Punnett Square Practice

https://learn.genetics.utah.edu/content/basics/observable

Notebook: Punnett Squares Practice

Vocab

Gene: A stretch of DNA that “codes” for a particular trait

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Allele: The different forms that gene can take

Vocab

Dominant Allele: When present, it will mask the recessive allele

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Recessive Allele: Only shows if no dominant alleles are present

Vocab

Genotype: what the actual gene (2 letters) looks like; “the letters, as in Hh, LL, ee”

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Phenotype: how the gene makes something physically look “brown eyes, attached earlobes…”

Vocab

Heterozygous: one dominant and one recessive allele

Tt, Rr, Dd

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Homozygous: both dominant or both recessive alleles

UU, YY, ZZ = homozygous dominant

ii, ee, ff = homozygous recessive

Vocab (will cover later)

Incomplete Dominance: two alleles blend to create a new phenotype

red flower, white flower, pink flower

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Codominance: two alleles both affect the phenotype in distinguishable ways

Punnett Squares and

Inheritance Practice

https://learn.genetics.utah.edu/content/change/makeyou/

By the end of today…

• Be able to draw a family tree and show how it is used to trace genetic information

Attached Earlobes

(recessive)

Attached Earlobes

(recessive)

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Phenotype

Attached Earlobes

(recessive)

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Genotype

Attached Earlobes

(recessive)

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Genotype