A Drosophila geneticist made a cross between females homozygous for three X-linked recessive mutations (y, yellow body; ec, echinus eye shape; w, white eye color) and wild-type males. She then mated the F1 females to triple mutant males and obtained the results shown. Which of the three genes is located in the middle of the other two?  

Which of the following is a/are possible offspring in a mating between grasshoppers?

A randomly pollinated strain of maize produces ears that are 24 cm long on average. In a population of maize produces from first cousin matings, the average ear length is reduced to 23 cm. Predict the average ear length in a population of “full-sibling” matings. Answer will fall into one of the ranges below.

Flower color in a certain plant is determined by two independently assorting genes, B and D. The dominant B allele allows a pigment precursor to be converted into a blue pigment. Without this conversion, the plant is white. The dominant allele D causes the blue pigment to degrade and the resulting phenotype is white, whereas the recessive allele d has no effect. A true-breeding white (bbDD) and a true-breeding blue parental strain were mated. If the F1s were then crossed, what portion of the F2s would you expect to be white?

A medical technician is analyzing a blood sample in a clinical lab. In determining the blood type the technician determines that the red blood cells have both A antigens present on the cell surface and B antigens present on the surface. In this case, the red blood cells are exhibiting a genetic characteristic known as:

Chickens that carry both the alleles for rose comb (R-pp) and pea comb (rrP-) have walnut combs (R-P-), whereas chickens that lack both of these alleles (that is, they are genotypically rr pp) have single combs. From the information about interactions between these two genes given in the chapter, determine the proportion of the offspring that will have the Walnut phenotype from the following crosses: (RrPp) x (rrPp)

In the Chi-Square test a critical value is:

True or False. In the preparation of a microarray analysis oligonucleotides labeled with fluorescent dyes are fixed to glass slides.

Geneticists calculate the __________ to analyze the effects of mating between relatives.

Which of the following is a mechanism that can compensate for an abnormal number of sex chromosomes in an individual? 1. Each X-linked gene could work half as hard (produce half of the total amount of gene product) in males as it does in females 2. One copy of each X-linked gene could be inactivated in females 3. Each X-linked gene could work twice as hard (produce twice the total amount of gene product) in females as it does in males