Huntington disease (HD) is a rare dominant  condition in humans that results in a slow but  inexorable deterioration of the nervous  system. HD shows what might be called  “age-dependent penetrance,” which is to say  that the probability that a person with the HD  genotype will express the phenotype varies  with age. Assume that 50% of those  inheriting the HD allele will express the  symptoms by age 40. Susan is a 35-year-old  woman whose father has HD. She currently  shows no symptoms. What is the probability  that Susan will show symptoms in five years?

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A: Option b NN x BN

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A: 50 percent chances.

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Q: Explain multiple Alleles using Human Blood Groups as an example.

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.