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Question: A karyotypically normal couple has a child with trisomy 21 Down syndrome. DNA analysis if 21q polymorphic markers reveals the following results. (Letters refer to polymorphic loci; numbers refer to alleles at that locus.) In which meiotic division did nondisjunction occur? Marker LocusFatherMother child A1, 22, 21, 2, 2 B1, 12, 21, 2, 2 C1, 11, 11, 1, 1 D1, 11, 21, 2, 2 (A)Maternal meiosis I (B)Maternal meiosis II (C)Paternal meiosis I (D)Paternal meiosis II (E)Paternal meiosis I or II
Both endocrine and nervous system are major regulating system of the body; but nervous system has been compared to an airmail delivery system and the endocrine to pony express. Briefly explain the comparison.
There are a many respiratory diseases that can affect a person's ability to maintain a healthy respiratory system.
Determine which of the following mutations is more likely to produce a severe rather than mild phenotypic consequence?
Briefly compare similarties in the release of the contents of cortical granules during the fertilization of the sea urchin ovum, with the release of neurotransmitters from terminal knobs of a stimulated neuron.
Which will you expect to increase significantly from M to G1. What does this tell you about how the cellular information for eye colour is pass on? Describe in detail.
Use living organisms to control pests are often used in many nations. What factors must be taken into account in using fungi to combat agricultural pests?
Explain a specific example of a cross in two parents, each homozygous for different traits, which would result in a phenotype that is distinct from either parental phenotype.
In a separate piece of paper, make a simple family tree for a couple showing children, and lineages from two children showing grand children, great grandchildren, great great grandchildren, and great great great grandchildren.
Explain why would we evolve so that when we are stressed our immune system is suppressed? Discuss how would this increase survival? What is the adaptive value of reflexes?
Irregularly a person is discovered to have one blue eye and one brown eye. This is caused by the creation of a new mutation. In which cell did the mutation occur?
Give an example of an area of research and science which requires a code of ethics when suggesting your modifications to the scientific method.
Suppose you were given ten ml of milk. You added 0.5 ml of the milk to 9.5 ml of sterile water. After mixing, one ml of the diluted milk was added to 99 ml of sterile water.
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