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| 1. | I have reviewed this report on Form N-CSR of American Century Asset Allocation Portfolios, Inc.; |
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| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or |
| | omit to state a material fact necessary to make the statements made, in light of the circumstances |
| | under which such statements were made, not misleading with respect to the period covered by |
| | this report; |
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| 3. | Based on my knowledge, the financial statements, and other financial information included in this |
| | report, fairly present in all material respects the financial condition, results of operations, changes |
| | in net assets, and cash flows (if the financial statements are required to include a statement of |
| | cash flows) of the registrant as of, and for, the periods presented in this report; |
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| 4. | The registrant's other certifying officer and I are responsible for establishing and maintaining |
| | disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company |
| | Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the |
| | Investment Company Act of 1940) for the registrant and have: |
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| | (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and |
| | | procedures to be designed under our supervision, to ensure that material information |
| | | relating to the registrant, including its consolidated subsidiaries, is made known to us by |
| | | others within those entities, particularly during the period in which this report is being |
| | | prepared; |
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| | (b) | Designed such internal control over financial reporting, or caused such internal control |
| | | over financial reporting to be designed under our supervision, to provide reasonable |
| | | assurance regarding the reliability of financial reporting and the preparation of financial |
| | | statements for external purposes in accordance with generally accepted accounting |
| | | principles; |
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| | (c) | Evaluated the effectiveness of the registrant's disclosure controls and procedures and |
| | | presented in this report our conclusions about the effectiveness of the disclosure controls |
| | | and procedures, as of a date within 90 days prior to the filing date of this report based on |
| | | such evaluation; and |
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| | (d) | Disclosed in this report any change in the registrant's internal control over financial |
| | | reporting that occurred during the second fiscal quarter of the period covered by this |
| | | report that has materially affected, or is reasonably likely to materially affect, the |
| | | registrant's internal control over financial reporting; and |
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| 5. | The registrant's other certifying officer and I have disclosed to the registrant's auditors and the |
| | audit committee of the registrant's board of directors (or persons performing the equivalent |
| | functions): |
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| | (a) | All significant deficiencies and material weaknesses in the design or operation of internal |
| | | control over financial reporting which are reasonably likely to adversely affect the |
| | | registrant's ability to record, process, summarize, and report financial information; and |
