Suppose that a grandfather, mother, and son all have the same homozygous dominant genotype for a gene that controls facial hair growth. The grandfather and son have thick beards, but the mother has no significant facial hair. What type of non-Mendelian inheritance is this? a) Sex-influenced inheritance Ob) Sex-limited inheritance O) Onset of genetic expression

What causes most of the phenotypic abnormalities in someone with Down's Syndrome? A) They have many gene mutations that produce nonfunctional proteins. B) They express too much of some proteins during development. C) Their cells cannot go through mitosis properly during development because they have an odd number of chromosomes. D) Their chromosomes cannot pair during meiosis.

In another family, a female child has wiggle ears, whereas her brother does not. Both parents are normal. A)can the wiggly ear be an autosomal recessive trait B) a sex linked recessive trait? Include Punnett Square in explanation.

PKU is a recessive disorder based on a single mutant gene. Consider that Noor is a carrier, but her partner Hamza has never had an incidence of PKU show up in his family history, which dates back to four generations. What is the likelihood their first child might develop PKU according to their genetics counselor?   a)    100%!   b)    50%   c)   25%   d)   0%

Sickle cell anemia is a recessive trait in humans. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the sickle cell allele, what is the probability that both of their first two children will be affected? A) none B) 1/16 C) 1/8 D) ¼ E) ½

Dominant alleles are so called because under most circumstances they____ a) code for genes that are never considered lethal c) they are expressed whenever present d)code for desired traits only e) they are found on all 22 somatic chromosomes and not on sex chromosomes

An unaffected woman for a human disorder marries and unaffected man and they have children. This results in 3 affected sons, and one unaffected daughter, which ends up having children later on with an unaffected man and has 2 affected sons. A) Draw a simple pedigree diagram for this family, including a legend. B) What is the likely mode of inheritance of this trait: Please explain C) Provide the genotypes of the original mother and the daughter. Use a capital letter for the dominant allele and lowercase letter for the recessive allele. D) If one of the affected sons from the original marriage marries a 2nd cousin that is a carrier of this trait and has children, what is the probability that they will have 3 affected sons?

Curly hair is due to a dominant allele in humans. Straight hair is a recessice allele. the heterozygous condition produces wavy hair, a. phenotype that appears as a blend of the two alleles. This is an example of which of the following patterns of inheritance.   a) Simple dominant b) Sex linkage C) Multiple allele d)Incomplete dominance