A person with trisomy-18 exhibits a collection of physical abnormalities that affect many organs including the brain. These physical abnormalities occur because

Which of the following is not one of the four criteria that the genetic material must fulfill?

DNA is able to store information because of

In linkage studies, a test cross involves a cross between a double heterozygote and an individual that is homozygous recessive for both genes. Recombinant offspring are produced when a crossover occurs 

Two different strains of plant exhibit a recessive phenotype of white flowers. When crossed, they produce offspring with wild-type purple flowers. This phenomenon of obtaining purple flowers is called __________ and it indicates that _________________________________.

In a chi square analysis involving genes that may be linked, the expected values are calculated 

Two genes are 36 map units apart. In a testcross, what percentage of offspring is expected to be recombinants?

Let’s suppose that three genes affecting eye color, body color, and wing length are on the same chromosome in fruit flies. In a test cross, if the number of recombinant offspring involving eye color and wing length is much higher compared to body color and eye color, these results suggest that

In humans, an individual who is XXY would be

By conducting testcrosses, researchers have found that the apple has 17 linkage groups. How many chromosomes would you expect to find in leaf cells?