Exam 19: Genetics and Inheritance

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 an individual homozygous dominant for this trait has a child with an individual who cannot roll his tongue, what is the chance that the child will have a heterozygous genotype?

A(n) ________ in a chromosome is often lethal and occurs when a part of chromosome breaks off or is lost.

The offspring resulting from a cross between a nearly white horse (cc) and a chestnut-colored horse (CC) is of an intermediate color (between white and chestnut). Which one of the following patterns of inheritance best explains this?

For several phenotypes in the human population, it is clear that more than just the genotype is influencing the expression of the trait. Analysis of human populations indicates that height and weight are examples of phenotypes under environmental influence as well as genotype. Provide evidence that would support the contention that both environment and genotype influence human weight.

The law of segregation states that

Variations of homologous genes that result in differences in structure and function are

Linked genes are not influenced by crossing-over during meiosis.

The inheritance of a trait that is determined by many genes acting together, such as eye color, is called ________ inheritance.

A recessive allele associated with chromosome 15 causes an enzyme deficiency disease called

Identify the mode of inheritance for each of the following traits. -human eye color

The flower color in this plant is inherited by incomplete dominance. If a red flower that is homozygous dominant is crossed with a white flower that is homozygous recessive, the color of the offspring flowers will be expected to be

A deletion occurs when a piece of chromosome breaks off and is lost.

A couple has a daughter who is color-blind. The mother is not color-blind, but the father is. What is the genotype of the mother for this trait?

During embryological development, if a certain gene on the Y chromosome is activated during the sixth or seventh week of development, the embryo will develop into a ________.

If both alleles of a particular gene are identical, the person is said to be

When a piece of chromosome breaks off and reattaches at another site on the same or another chromosome, this is called

What is the significance of crossing-over, independent assortment, and random fertilization?

Polygenic traits display phenotypes that

________ testing refers to the analysis of an individual's genetic material to determine predisposition to a particular health condition.

Which of the following is most likely involved in the determination of intelligence?