Exam 9: Patterns of Inheritance

________ genes violate Mendel's principle of independent assortment.

An individual with (naturally)curly hair and an individual with (naturally)straight hair mate; all of their offspring have (naturally)wavy hair.What is the relationship between the alleles for hair texture?

The ________ is most commonly found in nature.

Attached earlobes are recessive to free earlobes.What is the probability of having a child with attached earlobes when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

In humans,the presence or absence of dimples is a trait controlled by a single gene.What is the genotype of an individual who is heterozygous for dimples?

Please read the following scenario to answer the following question. The parents of a child with unusual disease symptoms take the child to a doctor for help.The doctor suspects that the condition might have a genetic basis.She recommends that the child be taken to a specialty clinic where physicians and staff members are trained to diagnose genetic diseases and counsel parents.Ultimately,the child is diagnosed with a rare recessively inherited disease.The parents are tested for the gene,and both are found to be heterozygous.The parents want to have another child but are afraid this child will also be affected. -What would genetic counselors say is the probability that the second child will have the disease?

An individual with the genotype AaBb produces four different gametes in equal proportions.This is a demonstration of ________.

Hypophosphatemia (vitamin D-resistant rickets)is inherited as a sex-linked dominant trait.The relevant gene is found on the X chromosome.What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?

What is the best explanation for a BbCc × bbcc cross producing offspring in a 5:5:1:1 phenotypic ratio?