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?
Answer: (a) Rr, rose
(b ) Rr x RR ———> all rose, Rr x rr Æ
1/2 rose, 1/2 single
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While the maximum number of electrons required to fill the outermost shell of an atom varies depending on the size of the atom, almost all of the smaller atoms (atomic numbers 2-20) are considered stable, and thus nonreactive, when they contain ________ electron(s) in the outermost shell.
A. 1 B. 8 C. 16 D. 2
Explain why you move your hand from hot stimuli before you register pain
What will be an ideal response?
Which of the following is a correctly written scientific name?
A) Homo sapiens B) Acer pensylvanicum C) musca domesticus D) Australopithecus afarensis
Recent studies of an oyster-rich bay indicated a high coliform count. What should the fisheries' officers do?
A. Nothing. A high coliform count is beneficial to humans who eat the oysters. B. Nothing. A high coliform count is good for oyster production. C. Nothing. A high coliform count is normal. D. Shut down the bay. A high coliform count is harmful to the oysters. E. Shut down the bay. A high coliform count is harmful to humans who eat the oysters.