AQA A-level BIOLOGY

AQA A Level Biology - 25 Mark Essays 2023

Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates participate in and is the scheme which was used by them in this examination. The standardisation process ensures that the mark scheme covers the students’ responses to questions and that every associate understands and applies it in the same correct way. As ...

In one species of squirrel, Sciurus carolinensis, fur colour is controlled by one gene, with two codominant alleles. CG represents the allele for grey fur colour, and CB represents the allele for black fur colour. Table 1 shows the three possible phenotypes. In a population of 34 S. carolinensis, 2 had black fur. Use the Hardy–Weinberg equation to estimate how many squirrels in this population had brown-black fur. Show your working. The actual number of squirrels in this population that ha...

AQA A level Biology 2021/2022 ms

AQA A LEVEL BIOLOGY 7402/1 MARK SCHEME 2020

AQA A-LEVEL BIOLOGY PAPER 1 2020MARK SCHEME(VERIFIED ANSWERS 2020).

A-level BIOLOGY Paper 1 Thursday 4 June 2020 Morning Time allowed: 2 hours Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), u...