Exam 9: Patterns of Inheritance

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?

Mendel's laws are based on the behavior of chromosomes during ________.

Mendel's law of segregation indicates that

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The F₁ plants have yellow seeds. What is the expected phenotypic ratio of seed color of the offspring of an F₁ × F₁ cross?

Scientists have long been interested in differences between dogs and wolves in their social behavior toward humans. Dogs and wolves share a common ancestor. In trying to understand the differences, a researcher analyzed data collected from 18 domesticated dogs and 10 wolves that had been raised by humans. Which data would be most useful to understand the genetic basis of this behavior?

Scientists have long been interested in differences between dogs and wolves in their social behavior toward humans. Dogs and wolves share a common ancestor. In trying to understand the differences, a researcher analyzed data collected from 18 domesticated dogs and 10 wolves that had been raised by humans. If she discovered that the degree of social relationship a dog exhibited toward humans was positively correlated with a chemical modification of a part of a chromosome rather than what alleles a dog had, this would be an example of ________.

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?

An individual who is heterozygous for cystic fibrosis ________.

To determine the phenotype of an individual who expresses a dominant trait, you would cross that individual with an individual who is homozygous recessive for that trait. This technique is referred to as a(n)________.

Many human traits, such as our performance on intelligence tests or our susceptibility to heart disease, are ________.

Which outcome could help you identify a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?

A purebred plant that produces yellow seeds is crossed with a purebred plant that produces green seeds. The seeds of all of the offspring are yellow. Why?

What would you examine to determine whether a trait is sex linked?

Please refer to the following art to answer the following questions. -In the accompanying art, you see a table with the actual number of offspring that resulted from a dihybrid cross. The numbers do not show the 9:3:3:1 ratio predicted. One phenotype occurred more than predicted; another occurred less. The reason could be because ________.

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?

Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis. The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele). -Mary has the genotype ________.

To determine the phenotype of an individual who expresses a dominant trait, you would cross that individual with an individual who ________.

A couple has two female children. What is the probability that their next child will be male?

In humans, free earlobes (E)are dominant to attached earlobes (e)and the presence of freckles (F)is dominant to the absence of freckles (f). If an individual heterozygous for both of these traits were to mate with an individual with attached earlobes and no freckles, what is the probability of having a child with attached earlobes and freckles?

Assume that having three nostrils is inherited as a sex-linked trait on the Y chromosome. A man with three nostrils has a daughter who has a son with a man who has only two nostrils. What is the probability that the three-nostril man's grandson has three nostrils?