Group 1: In dogs, a dominant gene (W) produces wire-haired texture. The recessive allele (w) produces smooth hair A homozygous wire-haired male is mated to a female with smooth hair Show the Punnett square. What genotypes and phenotypes are expected in the F1 generation, and in what ratios?
Genotypes:
Phenotypes
Group 2: Short hair (L) is dominant over long hair (1) in rabbits. Two heterozygous rabbits are mated. Show the punnett square. What phenotypes are expected, and in what ratios of the bunnies produced?
Genotypes:
Phenotypes:
Group 3: In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?
Genotypes:
Phenotypes:
Group 4: Both husband and wife are heterozygous for dimples. What are the chances that their children will have dimples?
Genotypes:
Phenotypes:
Group 5: Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation?
Genotypes:
Phenotypes:
Genotypes:
Phenotypes
Group 2: Short hair (L) is dominant over long hair (1) in rabbits. Two heterozygous rabbits are mated. Show the punnett square. What phenotypes are expected, and in what ratios of the bunnies produced?
Genotypes:
Phenotypes:
Group 3: In pea plants, spherical seeds (S) are dominant to dented seeds (s). In a genetic cross of two plants that are heterozygous for the seed shape trait, what fraction of the offspring should have spherical seeds?
Genotypes:
Phenotypes:
Group 4: Both husband and wife are heterozygous for dimples. What are the chances that their children will have dimples?
Genotypes:
Phenotypes:
Group 5: Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation?
Genotypes:
Phenotypes:
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Answer:
Group 1:
Punnett square:
| Ww | Ww |
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w | Ww | Ww |
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w | Ww | Ww |
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Genotypes: The expected genotypes in the F1 generation are Ww.
Phenotypes: The expected phenotype in the F1 generation is wire-haired texture.
Ratio: The ratio of genotypes and phenotypes in the F1 generation is 100% Ww, all wire-haired.
Group 2:
Punnett square:
| L1 | L1 |
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L | LL | LL |
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l | Ll | Ll |
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Phenotypes: The expected phenotypes in the offspring are short hair (LL) and long hair (Ll).
Ratio: The ratio of phenotypes in the offspring is 75% short hair (LL) and 25% long hair (Ll).
Group 3:
Genotypes: Both parents are heterozygous, so their genotypes are Ss.
Phenotypes: The expected fraction of offspring with spherical seeds is 75%.
Group 4:
Genotypes: Both parents are heterozygous for dimples, so their genotypes are Dd.
Phenotypes: The chances of their children having dimples are 75%.
Group 5:
Genotypes: The genotype of the first generation will be Hh.
Phenotypes: The phenotype of the first generation will be hornless.
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