Chapter 9 Patterns of Inheritance Power Point Lectures

9. 8 VISUALIZING THE CONCEPT: Genetic traits in humans can be tracked through family

Figure 9. 8 -2 KEY Female Mating Al Frank Beth Gary Charles Debbie 2

Figure 9. 8 -3 KEY Female Male Widow’s peak hairline trait Straight hairline trait

Figure 9. 8 -4 KEY Female Male Widow’s peak hairline trait Straight hairline trait

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Chapter 9 Patterns of Inheritance Power. Point Lectures Campbell Biology: Concepts & Connections, Eighth Edition REECE • TAYLOR • SIMON • DICKEY • HOGAN © 2015 Pearson Education, Inc. Lecture by Edward J. Zalisko

9. 8 VISUALIZING THE CONCEPT: Genetic traits in humans can be tracked through family pedigrees • The inheritance of human traits follows Mendel’s laws. • A pedigree • shows the inheritance of a trait in a family through multiple generations • demonstrates dominant or recessive inheritance • can also be used to deduce genotypes of family members. © 2015 Pearson Education, Inc.

Figure 9. 8 -2 KEY Female Mating Al Frank Beth Gary Charles Debbie 2 ND GENERATION Henry Straight hairline Isabel Juliana Widow’s peak 3 RD GENERATION Kristin © 2015 Pearson Education, Inc. H: widow’s peak allele h: straight allele 1 ST GENERATION Children Evelyn Widow’s peak hairline trait Straight hairline trait Lori

Figure 9. 8 -3 KEY Female Male Widow’s peak hairline trait Straight hairline trait H: widow’s peak allele h: straight allele 1 ST GENERATION Al Beth Charles Debbie Hh Hh hh Hh 2 ND GENERATION Evelyn Frank Gary Henry hh hh Hh Straight hairline Isabel Juliana Hh hh 3 RD GENERATION Kristin hh © 2015 Pearson Education, Inc. A parent with a widow’s peak who has a child with a straight hairline must be Hh. Kristin has a straight Lori hairline but her parents do not, so straight hairline must be homozygous recessive (hh). Widow’s peak

Figure 9. 8 -4 KEY Female Male Widow’s peak hairline trait Straight hairline trait H: widow’s peak allele h: straight allele 1 ST GENERATION Al Beth Charles Debbie Hh Hh hh Hh 2 ND GENERATION Evelyn Frank Gary Henry Isabel Juliana HH hh hh Hh Hh hh or Hh Straight hairline Widow’s peak 3 RD GENERATION Not all genotypes can be determined. Lori could be Kristin HH or Hh and there is no Lori to know (unless she HH hh way has some children and the or pedigree is extended). Hh © 2015 Pearson Education, Inc.