1. Warm-up: Copy and fill in table DescriptionFractionPercent One out of four ¼25% Two out of four Three out four Four our of four

2. Monohybrid Crosses

3. When the inheritance patterns of only one trait such as flower color is studied, the cross between two parent organisms is called a monohybrid cross. In a monohybrid cross, one allele from a female egg is joined with one allele from a male sperm.

4. Steps to analyzing the probability of a monohybrid cross

5. 1. Read the problem and determine what are the alleles: genotypes and phenotypes (Dominant, Recessive) In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

6. 2. What are the parents’ genotypes? In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

7. 3. What are the parents’ phenotypes? In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

8. 4. Draw a punnett square with 4 compartments. In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

9. 5. Take the genotypes for the parents and place it on the outsides of the punnett square. In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

10. 6. Cross the genotypes into the punnett square. In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

11. 7. From the information in the punnett square determine the offspring’s genotype percentages. In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

12. 8. From the genotype percentages determine the offspring’s phenotype percentages In Mice, black hair is dominant over white hair. If a white haired male is mated with a heterozygous female, what are the possible offspring genotypes and phenotypes

13. In a certain plant, red flowers are dominant over white flowers. A homozygous red flowered plant is crossed with a homozygous white flowered plant. What are the possible offspring genotypes and phenotypes?

14. Blonde hair is dominant over red hair. A mom with heterozygous blonde hair has a child with a dad with red hair. What are the possible offspring genotypes and phenotypes?

15. Warm-up Simplify the following fractions 1. 6/16 2. 8/16 3. 12/16 4. 2/16 5. 4/16 6. 10/16

16. Dihybrid Cross the inheritance patterns of two traits In a Dihybrid cross, two alleles from a female egg is joined with two alleles from a male sperm.

17. Dihybrid Cross 1. Read the problem and determine what are the alleles: genotypes and phenotypes (Dominant, Recessive). Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

18. 2. What are the parents’ genotypes? Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

19. 3. What are the parents’ phenotypes? Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

20. 4. Draw a punnett square with 16 compartments. Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

21. 5. Take the genotypes for the parents and determine the possible allele combinations using the arrow technique. Place the possible combinations on the outsides of the punnett square. Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

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23. 6. Cross the genotypes into the punnett square. Be consistent in the order you are putting the letters. Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

24. 7. From the information in the punnett square determine the offspring’s genotype fractions. Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?

25. 8. From the genotype percentages determine the offspring’s phenotype fractions. Blonde hair is dominant over red hair, and brown eyes are dominant over blue eyes. A mom with heterozygous blonde hair and blue eyes (Hhbb) has a child with a dad with red hair and homozygous brown eyes (hhBB). What are the possible offspring genotype and phenotype percentages?