Warm-Up # 7 3/12/13 • In humans, brown eyes (B) are dominant over blue (b)*. A brown- eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. 1) What is the man’s genotype? 2) The woman’s genotype? 3) Draw the Punnett square that illustrates this marriage. 4) What are the genotypes of the children?
Warm-Up # 7 3/12/13. In humans, brown eyes (B) are dominant over blue (b)*. A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. 1) What is the man’s genotype? 2) The woman’s genotype? - PowerPoint PPT Presentation
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Warm-Up # 7 3/12/13• In humans, brown eyes (B) are dominant
over blue (b)*. A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eyed.
1) What is the man’s genotype? 2) The woman’s genotype?3) Draw the Punnett square that illustrates
this marriage. 4) What are the genotypes of the children?
Bb bb
Bb bb
B b
b
b
Man’s genotype: Bb (Heterozygous Dominant)
Woman’s genotype: bb (Homozygous recessive)
Kid’s genotypes:
2-Bb (Heterozygous Dominant)
1-bb (Homozygous recessive)
Independent Assortment, Dihybrid Crosses, and Beyond
Dominant/ Recessive
Ch 11-3
What’s This???
• Essential Question– How are
independent assortment and dihybrids related?
• Objectives – What is the principle
of independent assortment?
– What inheritance patterns exist aside from simple dominance?
– Explain how Mendel’s principles apply to all organisms?
Independent Assortment Review
• Genes for different traits separate independently from one another when gametes are formed.
• In order to come to the conclusion of independent assortment, Mendel did an experiment…
Independent Assortment & 2-Factor Crosses
• Mendel followed 2 different genes.• It is called a two-factor (Dihybrid)
cross.– Type of Punnett Square – 16 squares– Results: 9:3:3:1 (ratio)
Dihybrid Crosses Example
• Followed two traits • Gene for seed color and texture