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Question: A couple's only child has Down Syndrome. An examination of the child's karyotype reveals that he has 46 chromosomes per cell, but that one chromosome is unusually large, and appears include large portions of chromosome 14 and chromosome 21. The couple fears that if they have another child, it will also have Down Syndrome. a. Estimate the probability that their next child would have Down Syndrome. Show your work. b. The mother is 25, and learned from her genetics course that for a woman her age, the chance of giving birth to a child with Down syndrome is 1 in 1205. Should the couple expect that their chances of having a Down syndrome child are about 1 in 1205? Explain. (Note for b: you can assume that the observation of 1 in 1205 women having a Down- Syndrome child is accurate. In other words, there was no significant sampling error.)
Reverse transcriptase might be present in cells that have not been infected by a retrovirus since of the presence of what.
HGT makes it possible for minimally useful genes to persist in bacerial population. The model proposes that unessential genes of related function are arranged in operons.
Describe why 0.9 percent NaCl is an isotoinc solution. In another word, please explian the calculation that shows its osmolality is 300mOsm.
Describe why extinction is necessary aspect of evolution. What would happen if nothing died and there were no extinction?
There are forty chromosomes in somatic cells of the house mouse. how many chromosomes does a mouse receive from its father and how many autosomes are present in a mouse gamete?
Explain physiological changes that occur in three different organ systems when food is ingested and how these systems coordinate a response in the human body.
If amino acid sequences might be useful in determining how closely related dissimilar species are but may not be very useful for identifying a particular species, suggest two reasons why.
How do Eukaryotic cells prevent the loss of important information? How do bacteria cope with this problem? These questions are pondered.while DNA is replicated in Eukaryotic cells.
What is the most possible explanation for how these proteins find their way to the mitochondria. What is the good range for a heartbeat stroke work in an anaesthetised sheep? Before and after the venous administration of adrenaline.
Result of mitosis is that daughter cells end up with the similar number of the chromosomes just as the parent cell. This is obtained through the chromosome duplication followed by the cell division.
Which of the following is the most posterior group of axial muscles? Muscles of the shoulder girdle. Muscles of the head and neck. Muscles of the pelvic floor
The idea is that this arrangement will allow animals and plants to migrate between refuges. Why would such migration be significant. Examine the F1 offspring from this cross.
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