Exam 19: Genetics and Inheritance

If a plant is inherited by complete dominance where homozygous dominant is a red flower color and homozygous recessive is a white flower color, what must the parents' genotypes be if the offspring was 25% white and 75% red?

In ________ dominance, the phenotype of the heterozygous genotype is an intermediate between the phenotype of either homozygous genotype.

If the two alleles of a particular gene pair are the same, the individual is ________ for that gene.

Red-green color blindness is an X-linked recessive disorder. Assume that a mother is a carrier and a father is color-blind. What is the chance that their son will inherit red-green color blindness?

Based on the information below, answer the following question(s), assuming complete dominance. "In humans, a widow's peak is a dominant trait, and a straight hairline is a recessive trait." -If an individual homozygous dominant for widow's peak has a child with an individual heterozygous for widow's peak, what is the chance that the child will have a homozygous dominant genotype?

Place the following in order from smallest, simplest, least complex, to largest and most inclusive.

According to Mendel's law of ________, genes of a gene pair separate from one another during the formation of gametes.

Polygenic inheritance depends on gene products from multiple genes.

A phenotypic trait is considered sex-linked when

An individual who inherits three copies of chromosome 18 will develop ________ syndrome.

Which of the following is characteristic of Klinefelter syndrome?

In incomplete dominance, the phenotype of the heterozygous genotype is an intermediate between the phenotype of either homozygous genotype.

A phenotype is determined by ________ and ________.

Match each of the following disorders to the genotype with which it is associated. -trisomy 21

Which one of the following genetic disorders is caused by the inheritance of a dominant-lethal allele?

A person born with Edwards syndrome has a genotypic condition identified as

Based on the information below, answer the following question(s), assuming complete dominance. "In humans, the ability to roll the tongue is a dominant trait; the inability to roll the tongue is a recessive trait." -If two individuals homozygous dominant for this trait have a child, what is the chance that the child will not be able to roll his tongue?

A couple is planning to have a child. The female is a carrier for hemophilia; the male does not have hemophilia. What is the chance that a female child will never develop hemophilia?

Sickle-cell anemia is a disease that alters the structure of hemoglobin, and in turn, can cause severe health problems in individuals if left untreated. The disease is expressed in homozygous recessive individuals, whereas the heterozygous condition usually does not result in any symptoms of the disease. Sickle-cell anemia primarily affects Africans and Caucasians of Mediterranean descent. Typically, when a disease occurs only in the homozygous recessive condition, the incidence of the gene in the population is predicted to decline overtime, particularly when it can be detected either phenotypically or by genetic testing. In East Africa, the disease still occurs in about 40% of the population. Give an explanation for why the incidence of the disease has remained so high in African populations.

A(n) ________ refers to the complete set of DNA within the chromosomes of an individual.