nuous or discontinuous variation.\n\nWrite the four characteristics below in the correct columns of the table:\n\n* Diastolic blood pressure\n* Cleft chin\n* Foot length\n* Tongue-rolling ability\n\n| Continuous variation | Discontinuous variation |\n| :--- | :--- |\n| | |","markscheme":"- Places \"Diastolic blood pressure\" and \"Foot length\" in the Continuous variation column M1\n- Places \"Cleft chin\" and \"Tongue-rolling ability\" in the Discontinuous variation column A1","marks":2,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"classify_variation","label":"Classify the variation","steps":[{"type":"drawing","order":0,"title":"Compare the two types","width":844,"height":220,"shapes":[{"id":"tbl-border","type":"line","color":"black","points":[{"x":42,"y":138},{"x":802,"y":138},{"x":802,"y":42},{"x":42,"y":42},{"x":42,"y":138}]},{"id":"tbl-v1","type":"line","color":"grey","points":[{"x":422,"y":138},{"x":422,"y":42}]},{"id":"tbl-h1","type":"line","color":"grey","points":[{"x":42,"y":90},{"x":802,"y":90}]},{"x":96.6,"y":49.5,"id":"tbl-head-0","text":"Continuous variation","type":"text"},{"x":458.9,"y":49.5,"id":"tbl-head-1","text":"Discontinuous variation","type":"text"},{"x":49.1,"y":101.5,"id":"tbl-cell-0-0","size":"s","text":"Many values: measured over a range","type":"text"},{"x":455.1,"y":101.5,"id":"tbl-cell-0-1","size":"s","text":"Separate categories, e.g. yes/no","type":"text"}],"caption":"Use one question: is the characteristic measured over a range, or does it put a person into a separate category?","diagramSpec":{"chart":{"kind":"table","rows":[["Many values: measured over a range","Separate categories, e.g. yes/no"]],"columnHeaders":["Continuous variation","Discontinuous variation"]}}},{"type":"text","order":2,"title":"Place measured characteristics","content":"**Diastolic blood pressure** is a measured pressure, and **foot length** is a measured length. Each can take many values over a range, so put both in **Continuous variation**.\n\nThis earns **M1**: both continuous examples must be in the correct column.","highlights":[{"text":"Diastolic blood pressure","location":"specification"},{"text":"Foot length","location":"specification"}]},{"type":"text","order":3,"title":"Place category characteristics","content":"A **cleft chin** is recorded as present or absent, and **tongue-rolling ability** is recorded as able or unable. These are separate categories, so put both in **Discontinuous variation**.\n\nThis earns **A1**: both discontinuous examples must be in the correct column.","highlights":[{"text":"Cleft chin","location":"specification"},{"text":"Tongue-rolling ability","location":"specification"}]}]}],"generatedAt":"2026-07-22T07:39:33.615Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"48d8617a-c075-4684-a252-f70d7c42f7d0","label":"b","content":"Identical twins in sheep occur when an embryo splits into two.\n\nIn the diagram below, some of the chromosome numbers in the different cells have been given to you.\n\n![A flowchart depicting chromosome numbers during fertilization and embryo splitting in sheep.](https://assets.mathsgenie.co.uk/aqa-qb/68e9640f-8451-421b-8057-bcb7c89142b7.png)\n\nComplete the diagram to show the number of chromosomes in:\n\n* The sperm cell\n* The zygote\n* The cell in Lamb Y's body.","markscheme":"- Identifies the chromosome number in the sperm cell as $27$ B1\n- Identifies the chromosome number in the zygote as $54$ B1\n- Identifies the chromosome number in the cell in Lamb Y's body as $54$ B1","marks":3,"order":1,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"gcse_biology__ocr","summaries":[{"id":"002d902f-7386-475b-ab15-14ed936e5a30","difficultyBand":"easy","calculatorUse":null},{"id":"011f50a2-2e3c-4f37-abea-5386031f3fa8","difficultyBand":"medium","calculatorUse":null},{"id":"04b281ba-1d76-4ec1-be89-abc6e681b4aa","difficultyBand":"medium","calculatorUse":nu

Inheritance

Question 24

Inheritance Questions

Inheritance

Question 24

Inheritance Questions