If the gene for yellow body color (y) is an X-linked
recessive and its dominant counterpart (y+) produces
wild body colors, give the phenotypes expected and
their frequencies for the following four crosses:
(a) yellow female x wild male
(b) wild carrier female x wild male
(c) wild carrier female x yellow male
(d) homozygous wild female x yellow male What will be an ideal response?
Answer: (a) yellow male wild female; (b)1/4 wild male, 1/4 yellow
male, 1/4 wild female, 1/4 wild carrier female; (c) 1/4 wild
male, 1/4 yellow male, 1/4 yellow female, 1/4 wild carrier
female; (d) 1/2 wild carrier female, 1/2 wild male
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_____________ infects the CD4+ T cells, which are required for normal immunity.
Fill in the blank(s) with the appropriate word(s).
Interferons____
a. make holes through bacterial cell membranes b. make holes through bacterial cell walls c. prevent entry of viruses into cells d. block the replication of viruses within cells e. bind iron and make it unavailable for bacteria and viruses
Which process plays the most important role in the phosphorous cycle?
a. cell respiration b. evaporation c. erosion d. combustion e. transpiration
What is the final electron acceptor in anaerobic respiration?
What will be an ideal response?