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Heredity : Inheritance and Variation of Traits

Heredity : Inheritance and Variation of Traits . Traits. Inherited A characteristic passed on from one generation to the next. Physical appearance or actions parents do too. Behavioral Influenced by the environment that one lives in Learned through observation or teaching.

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Heredity : Inheritance and Variation of Traits

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  1. Heredity: Inheritance and Variation of Traits

  2. Traits • Inherited • A characteristic passed on from one generation to the next. • Physical appearance or actions parents do too. • Behavioral • Influenced by the environment that one lives in • Learned through observation or teaching

  3. Inherited Trait examples • Can roll tongue • Free earlobe • Widow’s peak • Hitchhiker’s thumb

  4. Behavioral (acquired trait) • Riding a bike • Reading • Writing • Sport • Hairstyle • Cut of extremity • Skill

  5. Strength of Traits • Dominant • Stronger of two traits • Represent with capital letter • Recessive • Weaker of two traits • Represent with lowercase letter Homozygous: Both genes are the same from the parents (RR or rr) Heterozygous: One of each type of trait given by a parent (Rr)

  6. Punnett Square • Used in genetics to predict the make up of genes given the traits of parents.

  7. Sample Punnett Squares

  8. Try on your own Let’s say that in seals, the gene for the length of the whiskers has two alleles.Thedominant allele (W) codes long whiskers and the recessive allele (w) codes for short whiskers. What is the probability of producing offspring that have short whiskers from a cross of two long-whiskered seals, one that is homozygous dominant and one that is heterozygous? Show your work on the Punnett square. If one parent seal is a heterozygous long-whisker and the other is short whiskered, what is the probability that the offspring will have short whiskers?

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