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Flower color on snapdragons is controlled by a single gene. If red snapdragons are crossed with yellow snapdragons and the result is all orange snapdragons, what can explain this observation genetically?

In a gene mapping project, what does a LOD score of 3.0 mean?

A skin cell in an adult mouse has 38 total chromosomes. How many total chromosomes does a mature sperm cell have from the same mouse?

A, B and C are linked genes. Recombination between A and B is 3%; between A and C is 6%; and between B and C is 9%. What is the order of these genes on the chromosome?

A patient is experiencing extreme fatigue, muscle weakness, and poor eyesight. The symptoms are consistent with a mitochondrial disorder, but the patient’s mother is healthy. Select a plausible explanation(s). Choose all that apply.

Based on a patient’s family history with a particular disease, you draw out the pedigree above. The pedigree indicates which family members are affected, but carriers are not marked. Which mode of inheritance best fits the pattern of this disease? (Consider family members who are affected as well as family members who may be carriers, too.)

A healthy man and a healthy (unaffected) woman have a son with Lesch-Nyhan syndrome, an X-linked recessive trait. What is the percent chance that this couple’s daughter will have Lesch-Nyhan syndrome?

A widow’s peak hairline is an example of a Mendelian trait. If he were not bald, my father would have a widow’s peak. This is an example of:

How could an individual have a trisomy?

Please match the phase of meiosis with the activity in the cell.