It derives its name from the odor of the urine of affected individuals.

need help

using a Punnett square 

genetics problems

Maple syrup urine disease is a rare inborn error of metabolism. It derives its name from the odor of the urine of affected individuals. If untreated, affected children die soon after birth. The disease tends to recur in the same family, but the parents of the affected individuals are always normal. Is the disease caused by a dominant or recessive gene?

Huntington's chorea is a rare, fatal disease that usually develops in middle age. It is caused by a dominant gene. A phenotypically normal man in his early twenties learns that his father, who is 55, has developed Huntington's chorea. His mother is 57 and appears to be normal. What is the probability that he will develop symptoms later on? H=Huntington's chorea and h= normal.

Monohybrid crosses with incomplete dominance.

When Mexican hairless dogs are crossed with normal- haired dogs, about half the pups are hairless and half have hair. When, however, two Mexican hairless dogs are matted, about a fourth of the pups produced have hair, about one- half are hairless, and same deformed pups are born dead. What is the genotype of a normal hairless dog? What genotype leads to deformities and death. How do you know? Support your answer by using a Punnett square to show why a cross between a Mexican hairless dog and a normal-haired dog would result in ratios of normal haired, hairless, and deformed/ dead puppies.

In human, hairs form is probably a case of incomplete dominance with C= curly, S= straight, and the heterozygous condition, CS, causing wavy hair. What parents would produce 100% wavy—haired children.