Exam 15: Linkage and Chromosomes

Use the following figure to answer the question. Shaded symbols indicate affected individuals. The pedigree in the figure shows the transmission of a trait in a particular family. Based on this pattern of transmission, the trait is most likely ________.

The SRY gene is best described as ________.

Which of the following is an example of monosomy in humans?

Abnormal chromosomes are frequently found in malignant tumors. Errors such as translocations may place a gene in close proximity to different control regions that could result in which of the following events?

Use the following information to answer the question. In a Drosophila experiment a homozygous wild-type female was crossed with a yellow-bodied male. All of the resulting F1 flies were phenotypically wild type. Crossing the F1 flies resulted in F2 flies having the characteristics shown in the figure. Which of the following statements best describes the location of the yellow body locus?

Red-green color blindness is an X-linked recessive trait in humans. Two people with normal color vision have a son with colorblindness. Given this information, the genotypes of the parents are ________.

Recombination between linked genes is an adaptive advantage within a changing environment because ________.

Genomic imprinting is generally due to the addition of methyl (-CH3) groups to cytosine nucleotides to silence a given allele of a gene. If this process depends on the sex of the parent who transmits the gene, which of the following statements must be true?

What is the greatest benefit of using a testcross to determine an unknown genotype?

In cats, an X-linked locus is responsible for fur color. There are two known alleles at this locus. One results in black fur color; the other results in orange fur color. A heterozygote animal has patches of orange and black fur (tortoiseshell). Which of the following explains the patches of color in female heterozygote cats?

Which of the following statements is generally true of aneuploidies in newborns?

A couple has a child with Down syndrome. Which of the following is the most probable cause of the child's condition?

Use the following map of four genes on a chromosome to answer the question. When collecting data from genetic crosses which gene pair is most likely to show the highest frequency of recombination?

Use the following information to answer the question. In a series of mapping experiments, the recombination frequencies for four different linked genes of Drosophila were determined as shown in the figure. Based on this information, what is the order of these genes on a chromosome map?