12) An inversion in a human chromosome often results in no demonstrable phenotyp
ID: 262543 • Letter: 1
Question
12) An inversion in a human chromosome often results in no demonstrable phenotypic effect in the individual. What else may occur?
7) In one cross of a black Labrador retriever with another black Labrador retriever, the results were as follows: 9/16 black, 4/16 yellow, 3/16 brown. The genotype eebb must result in which of the following?
6) Feather color in budgies is determined by two different genes, Y and B, one for pigment on the outside of the feather and one for the inside. YYBB, YyBB, or YYBb is green; yyBB or yyBb is blue; YYbb or Yybb is yellow; and yybb is white. A blue budgie is crossed with a white budgie. Which of the following results is possible?
4) Anhidrotic ectodermal dysplasia is an X-linked recessive disorder characterized by sparse body hair and no sweat glands. An affected man intends to marry a woman whose family has no history of the disease. What are the chances that a given child of theirs will have the disorder ?
a) There may be deletions later in life.Explanation / Answer
4) A. 0%
Man is affected --> XdY
Female is undiseased --> XX
XX XdY
XXd (daughters are carriers) XY (Males are normal)
Therefore 0%chances of child to have disorder as daughters will be carriers and sons will be normal
7) B. Yellow.
BbEe crossed with BbEe
BBEE -1, BBEe - 2, BbEE - 2, BbEe - 4 = 9/16 black
BBee, bbee, Bbee - 2 = yellow 4/16
bbEE, bbEe -2 = 3/16 brown
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