UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level BIOLOGY 5090/01 Paper 1 Multiple Choice October/November 2006 1 hour Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. This document consists of 18 printed pages and 2 blank pages. IB06 11_5090_01/2RP UCLES 2006 [Turn over www.XtremePapers.com
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS
General Certificate of Education Ordinary Level
BIOLOGY 5090/01
Paper 1 Multiple Choice
October/November 2006
1 hour
Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended)
READ THESE INSTRUCTIONS FIRST
Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.
This document consists of 18 printed pages and 2 blank pages.
39 Flower colour is controlled by a single pair of alleles, the allele for red colour is dominant to the allele for white colour.
A plant homozygous for red flower colour is crossed with a plant homozygous for white flower colour. All the resulting plants have red flowers (F1 generation).
When these are crossed with each other, 18 plants were obtained. 12 plants have red flowers and 6 have white flowers (F2 generation).
What ratio is expected in the F2 generation and what ratio has been obtained?
expected ratio
red to white obtained ratio red to white
A 1:1 1:1
B 1:1 2:1
C 3:1 2:1
D 3:1 3:1
40 A recessive homozygote is crossed with a heterozygote.
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