Question
Description acceptable. This quantity can vary between two and three across cells in the human body after a di·gynic or di·spermic fertilization. For 10 points each:
[10m] Give either the six-letter name or a description of this quantity, which is three for cells in the endosperm and alternates between one and two in the generations of an angiosperm.
ANSWER: ploidy [or the number of copies of each chromosome in a cell; accept copies or copy number of DNA; accept any answers that include the words haploid, diploid, or triploid; prompt on n; reject “number of chromosomes”]
[10e] Regardless of ploidy, the total chromosome count in any human cell should be multiples of what odd integer, the haploid chromosome count?
ANSWER: 23
[10h] 69-chromosome zygotes immediately split into diploid and triploid lineages in these cells, the first products of zygotic cleavage. They divide to form the morula.
ANSWER: blastomeres [reject “blastula” or “blastocyst”]
<Adam Silverman, Science - Biology> ~22183~ <Editor: Adam Silverman>
Data
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| 2024 PACE NSC | 06/08/2024 | Y | 36 | 13.06 | 89% | 39% | 3% |