AP Bio Unit 5 Review Questions

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A diploid cell has 4 pairs of homologous chromosomes How many different chromosome arrangements are possible during independent assortment of Metaphase 1?

4 cells with 40 (single chromatid) chromosomes each

If a diploid cell with 80 chromosomes undergoes meiosis and cytokinesis, which of the following correctly describes the results?

2 cells with 80 (single chromatid) chromosomes each

If a diploid cell with 80 chromosomes undergoes mitosis and cytokinesis, which of the following correctly describes the results?

(picture) the stage with a light x chromosome and a dark x chromosome side by side horizontally on each side of the cell

Of the following stages of meiosis illustrated for a typical cell, which contributes most to diversity among warblers?

An increase in genetic variation

The processes illustrated in the models depicted above all result in which of the following ?

ZXA and AXZ (both choices a and c are correct)

A chromosome contains three genes. Genes A and Z have a crossover frequency of 19.6%. Genes A and X have a crossover frequency of 13.2% and genes X and Z have a crossover frequency of 6.4%. What is the relative order of the genes on the chromosome?

If both have the allele for HC, should an insurance company raise their rates because of the results of the test?

A man with high cholesterol levels is about to marry a woman whose total cholesterol levels are also higher than average. A physician has suggested they get tested for the HC allele. Which of the following is a valid ethical question concerning the test?

1/16

For a plant with the genotype WwXYyZz, what is the probability that the plant will produce a gamete with a haploid genotype of Wxyz?

The genes for body color and wing shape are located close to each other on the same chromosome

In Drosophilia melanogaster the allele for wild-type tan body color B is dominant to the recessive allele for black body color b. Similarly, the allele for wild type wing shape V is dominant to the recessive allele for vestigial wing phenotype. In the cross diagrammed above, the expected and observed results are shown. Which of the following best explains the observed results of the cross.

The two genes are linked on an autosome

In the first cross, a female with wild-type wings and eyes is mated with a male with vestigial wings and cinnabar eyes. All the F1 individuals have wild-type wings and eyes. In the second cross, female F1 flies are mated with males with vestigial wings and cinnabar eyes. The phenotypes of 500 F2 individuals are shown in the table. Which of the following is the most likely explanation of the results?

1/2

In the human pedigree shown above, squares represent males, circles represent females, and shaded symbols indicate individuals affected with a disorder. One of the affected males from the third generation has a child with a female who is a carrier. For the pedigree shown above, which of the following best expresses the probability that the couple's first son will be affected with the disorder?

1/4

Male chickens carry two Z chromosomes, while female chickens carry one z sex chromosome and one w sex chromosome. Located on the z chromosome is a gene for barring. Barred feathers have black and white stripes. The barred trait is dominant to the unbarred trait. What proportion of the resulting progeny are expected to be barred males with single combs?

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PKU is an inherited disease caused by an autosomal recessive allele. If two individuals who are carriers of PKU have two children, what is the probability that neither child will have PKU?

The diagram illustrates the results of nondisjunction during gamete formation

Th diagram above depicts of a karyotype of an individual human. Which of the following statements concerning in the karyotype in the diagram is true?

The allele for blue is an x linked dominant allele because there are no blue male offspring in cross 2

The data above represent the results of three different crosses involving the inheritance of a gene that determines whether a certain organism is blue or white. Which of the following best explains the mechanism of inheritance of the gene?

maternal mitochondrial mutations are inherited by all of a mothers offspring

The pedigree above shows the inheritance of a dominant allele of a gene in a family over several generations. Circles represent females and squares represent males. Shaded symbols indicate individuals who posses the dominant allele. The pedigree suggests that the gene is on a nuclear chromosome, and not on mitochondrial DNA, because:

During meiosis, crossing over leads to recombination of alleles between homologous chromosomes

The process depicted in the image above is best summarized by which of the following descriptions?

Prokaryotic chromosomes have a linear shape

Which of the following is not true of prokaryotic chromosomes?

Were your parents or grandparents ever diagnosed with Huntington's disease?

Which of the following questions will best help the genetic counselor to evaluate the risk of the young man developing Huntington's disease and transmittting it to his children?

Rr XtXt RrXtY

Which of the following represents a cross between a white-eyed female and a red eyed male?