Exam 11: Mendelian Patterns of Inheritance

Unattached earlobes (EE or Ee) are described in the textbook as dominant over attached earlobes (ee). A couple both have unattached earlobes. Both notice that one of their parents on both sides has attached earlobes (ee). Therefore, they correctly assume that they are carriers for attached earlobes (Ee). The couple proceeds to have four children.

If a human who is a tongue roller (T) and has unattached ear lobes (E) marries a person who cannot roll their tongue and has attached earlobes, could they produce an offspring that was also a non-tongue roller with attached earlobes? What would be the genotype of the first parent? the second parent?

A range of genotypes and phenotypes occur in polygenic inheritance. Draw a graph that depicts this pattern of continuous variation in polygenic inheritance.

Which characteristic of pea plants were important in their selection as Mendel's research organism?

The most common lethal genetic disease among Caucasians is

In the use of a Punnett square for genetic results of crossing individuals

Haiti is settled by peoples of both African and European ancestry. A young couple, both with mixed ancestry, marry and have several children. The children vary widely in the amount of skin melanin production, with one child being lighter than both parents, and one being darker. The simple explanation for this is

During Mendel's pea plants experiment he discovered that the trait for tallness is dominant to that of shortness. Which of the following statements is correct?

Where does independent assortment occur in meiosis (what stage)? Where is the law of segregation evident in meiosis? What is the result of independent assortment and segregation? Explain your answer.

Since each child of two heterozygous parents has a 50% chance of receiving a recessive trait from each parent,

Each gamete carries one factor, now called an allele, for each inherited trait.

The ability to roll the edges of the tongue upward in a U-shape has been considered to be an inherited ability. The standard assumption is that tongue-rolling is a dominant allele at a single gene locus. Which of the following would cast doubt on this assumption?

What is the blending theory of inheritance?

Which is NOT true according to Mendel's law of segregation?

An individual with blood type A marries an individual with blood type B. An individual with blood type A marries an individual with blood type B. A. What blood types could their offspring exhibit? B. Provide the possible genotypes of parents and offspring produced. C. What pattern of inheritance is this?

Which occurrence is when an individual inherits a dominant gene but does not fully express the dominant phenotype?

What is the blending theory of inheritance? How did Mendel disprove this theory?

In pea plants, the gene for round seed (R) is dominant, and wrinkled seeds (r) are recessive. The endosperm of the pea is also either starchy, a dominant gene (S), or waxy (s). What can be said of a fully heterozygous, dihybrid cross?

Which of the following disorders is not a X-linked trait?

As many as 60% of people in malaria-infected regions of Africa have the sickle-cell allele, but only about 10% of the U.S. population of African ancestry carries the allele. Malaria remains a major disease in central Africa but has not been a serious problem in the U.S. for many generations. What is/are the reason(s) for the difference in the percentages and what is a reasonable statement about future percentages?