Exam 12: Inheritance, Genes, and Chromosomes

A scientist works with a particular strain of bacteria.Sometime after a cross-contamination event in the lab, she finds that her bacteria have now acquired antibiotic resistance.She concludes that the strains have undergone _______.

When we multiply the probabilities of two genetic events to obtain the probability that both events will occur together, we

Classical albinism results from a recessive allele.What are the expected probabilities for the progeny of an albino female and a fully pigmented male with an albino father?

The genotype of an organism that expresses a dominant trait can be determined by

To determine the probability of an event that can occur in two or more different ways, one should _______ the individual probabilities.

In Drosophila, the genes for body coloration and eye size are on different chromosomes.Normal-colored bodies are dominant to ebony-colored (very dark) bodies, and normal-sized eyes are dominant to eyelessness.Line A is true breeding for normal bodies and normal eyes, whereas line B is true breeding for ebony bodies and eyelessness.From an F₂ cross between lines A and B, 800 flies are scored.How many F₂ flies are expected to have both normal body color and normal eyes?

You are working with an organism of the genotype AAbbCcDDeeFFGgHHiiJJKKLl.How many different gametes with respect to these genes could this individual produce, assuming no linkage among the different genes?

Draw a pedigree for at least three generations and 12 individuals that shows the transmission of a dominant autosomal trait.

Crosses between red and white true-breeding plant types yield offspring that are pink in color.When these pink offspring are crossed with other pink individuals, the resulting progeny show a range of color.This result is consistent with the theory of _______ inheritance.

Approximately half of all human newborns are male because

Some women are genetically XY.What is the most likely explanation for this?

An organism that produces either male gametes or female gametes, but not both, is called

Which observed phenotypic pattern in a pedigree would make it more likely that an inherited trait is recessive rather than dominant?

A test cross is used to determine whether an individual with

A mutant phenotype in humans appears more often in males than in females and often skips a generation.From this, you can conclude that the allele responsible is

Which value cannot be a probability?

Egg and Fluffy are two linked bird genes that are 16 map units apart.The E allele of Egg produces large eggs, and the e allele produces small eggs (E is dominant).The F allele produces fluffy feathers, and the f allele produces nonfluffy feathers (F is dominant).If EeFf is crossed with eeff, what proportion of the offspring should be birds that produce small eggs and nonfluffy feathers? (Note: Assume that the parents of EeFf were EEFF and eeff.)

The physical appearance of an organism is called its

Which organelle does not contain DNA?

Human geneticists assume that any allele that causes an abnormal phenotype is