REVIEW PROBLEMS – Chapter 9

FOR THE FOLLOWING: MONOHYBRIDS (ONE TRAIT)

  1. INDICATE THE TYPE OF INHERITANCE DEMONSTRATED BY THE PROBLEM
  2. LIST GENOTYPES WITH PHENOTYPES.
  3. INDICATE PHENOTYPES PROBABILITIES
  4. STATE THE GENOTYPIC AND PHENOTYPIC RATIOS
  5. ANSWER ANY QUESTIONS ASSOCIATED WITH THE PROBLEM
  1. You have two rose plants, both with pink flowers. You cross the two plants and are surprised to find that, while most of the offspring are pink, some are red and some are white. Perform a cross of red flowers and pink flowers.

**Your mother decides she would like some of the pink roses. Which cross would give you the most pink flowered plants?

**You like the red flowers and would like to make more. What cross would you perform to produce the most red plants?

  1. In northeast Kansas there is a creature known as a wildcat. It comes in three colors, blue, red, and purple. A homozygous (BB) individual is blue, a homozygous (bb) individual is red, and a heterozygous (Bb) individual is purple. Cross a purple wildcat with a purple one?

**What is the probability that a blue wildcat and a red wildcat will produce a purple wildcat?

**What is the probability that a blue wildcat and a red wildcat will produce a blue wildcat?

  1. Hazel eyes are dominant over blue. Jim and Sue are married. Jim has blue eyes and Sue is a carrier. Sue’s father and mother have hazel eyes. Sue has a sister, Marie, who has blue eyes.

Perform 2 separate punnett squares: one for Jim and Sue; the other for Sue’s mother and father. Then do the 5 things stated in the directions.

**What is the probability of Sue’s Mother and Father having children with hazel eyes?

**If Marie has a child in the future with a man who is a carrier, what is the probability that their children will have hazel eyes?

**If Marie has a child in the future, is it possible for the child to be dominant?

**What is the probability that Sue and Jim have children with hazel eyes?

  1. The lubber grasshopper is a very large grasshopper, and is black with red and yellow stripes. Assume that red stripes are expressed from the homozygous RR genotype, yellow stripes from the homozygous YY genotype, and both from the heterozygous genotype. What will be results of the F1 generation resulting from a cross of two grasshoppers, one with red and yellow stripes and the other with red stripes?

**Assume a male grasshopper has red stripes only. What would have to be the possible genotypes of the female for any chance of hybrid offspring to be produced?

**What genotypes does the parent generation need to have to produce a 100% of grasshoppers with red and yellow stripes?

FOR THE FOLLOWING: DIHYBRIDS (TWO TRAITS)

  1. INDICATE THE TYPE OF INHERITANCE DEMONSTRATED BY THE PROBLEM
  2. LIST GENOTYPES WITH PHENOTYPES.
  3. INDICATE PHENOTYPES PROBABILITIES
  4. STATE THE PHENOTYPIC RATIOS
  5. ANSWER ANY QUESTIONS ASSOCIATED WITH THE PROBLEM
  1. Use ‘H’ for hair color and ‘B’ for eye color. Brown hair is dominant over blonde, and green eyes are dominant over blue eyes. Mom is heterozygous for brown hair and a carrier of blue eyes. Dad is a hybrid for brown hair and hehas green eyes. Mom and dad have the same genotype for eye color.
  1. Raccoons have rings around their tails and a habit of washing their food in water before eating it. Suppose wide bands on the tail are BB, medium sized bands are BN, and narrow bands are NN and that washing all their food is AA, washing some of their food is AF, and washing no food is FF. How many of each genotype will be in the F1 generation resulting from a cross of two raccoons, both with medium sized tail bands and one that washes all his food, while the other that washes some of her food?
  1. Raccoons have rings around their tails and a habit of washing their food in water before eating it. Suppose wide bands on the tail are BB, medium sized bands are BN, and narrow bands are NN and that washing all their food is AA, washing some of their food is AF, and washing no food is FF. How many of each genotype will be in the F1 generation resulting from a cross of two raccoons, both with medium sized tail bands and both wash some of her food?

What phenotype is most likely to occur?