Reference no: EM133496212
Assignment:
Task: Genetic problems
In humans, the recessive allele that causes a form of red-green colour blindness (c) is found on the X chromosome.
- Determine the genotypes and phenotypes of the F, generation from a colour-blind father and a mother who is homozygous for normal colour vision.
- Determine the genotypes and phenotypes of the F, generation from a father who has normal colour vision and a mother who is heterozy- gous for colour vision.
- Draw the possible Punnett squares to determine the genotypes of parents that could produce a daughter who is colour blind.
1. Consider a cross between a pea plant that is heterozygous for round seeds and a pea plant that has wrinkled seeds. The allele for round seeds (R) is dominant over that for wrinkled seeds (r). Using a Punnett square, determine the genotypes of the offspring.
2. In guinea pigs, the black coat (B) is dominant over the white coat (b), and straight hair (H) is dominant over curly hair (h). Using a Punnett square, com- plete the cross between a heterozygous black, curly-haired individual and a homozygous straight-haired, white individual. State the parent genotypes and gametes, and the F, phenotypes and genotypes.
3. Hypophosphatemia is a dominant genetic disorder caused by a deficiency of phosphates in the blood. Assuming the other parent is free of the disor- der, males with the disorder will pass it on to all their daughters, but not their sons. Females with the disorder will pass it on to approximately half of their children.
- Is this pattern of inheritance autosomal or sex-linked? Explain.
- Draw Punnett squares to show the inheritance pattern of the disorder in each of the two scenarios.