What term describes chromosomes that fail to separate properly during anaphase I or anaphase II of meiosis, causing aneuploidy such as Down syndrome?
Answer and explanation
Correct answer: B. nondisjunction
- Step 1: Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate, resulting in gametes with n+1 or n-1 chromosomes (e.g. Trisomy 21). Answer: nondisjunction. Why not the others: Translocation is swapping segments between non-homologs.
Practise more Biological Sciences, Genetics and Physiology.
Free questions with an explanation for every one, and full timed University of the Philippines College Admission Test mock tests.
More Biological Sciences, Genetics and Physiology questions
- Which cellular organelle is responsible for synthesizing ATP through oxidative phosphorylation during aerobic cellular respiration?
- In Mendelian genetics, what is the expected phenotypic ratio in the F2 generation of a monohybrid cross between two heterozygous individuals…
- During which phase of meiosis does crossing over (homologous recombination) occur?
- What is the central dogma of molecular biology describing the flow of genetic information?
- Which enzyme unzips and unwinds the DNA double helix at the replication fork during semi-conservative DNA replication?
- What is the primary function of hemoglobin in human erythrocytes?