In poultry, rose comb is controlled by a dominant allele, and its recessive allele controls single comb
(a) Give the genotype and phenotype produced from crossing a pure-breeding rose comb chicken
with a pure-breeding single comb chicken.
(b) Give the results of the backcross of the F1 hybrid with both pure-breeding parents. What will be an ideal response?
(a) Rr, rose
(b) Rr ? RR ? all rose, Rr ? rr ? 1/2 rose, 1/2 single
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In the experiment performed by Benzer for intragenic mapping which of the following is the most critical control?
A. Perform the experiment with each different virus alone to determine the rate of reversion mutation B. Re-type the strain of E. coli C. Test the agar to make sure it can support E. coli and viral growth D. Perform at least five dilutions to make sure the dilutions were performed correctly
The limnetic zone is the shallow-water area along the shore of a lake or pond
____________________ Indicate whether the statement is true or false.
When 2 antimicrobial agents aew used together and the total effect is less than their individual effects, this is called
A. additive effect B. synergism C. indifference D. antagonism
Vertebrates that practice internal fertilization employ three strategies for embryonic and fetal development. In one strategy, the female retains the eggs within her body and the young are fully developed when they hatch inside of her. What is this called?
A. Oviparity B. Protandry C. Ovoviviparity D. Viviparity E. Protogyny