Download Questions

Questions
Q1.
The diagram shows a chromosome.
(i) Use words from the box to complete the sentences.
(2)
Chromosomes have sections which code for specific characteristics.
Each characteristic is coded for by a . . . . . . . . . . . . . . . . . These exist in alternative forms called . . . . .
...........
(ii) Complete the sentence by putting a cross (
) in the box next to your answer.
In a human body cell, chromosomes are found in the
(1)
A cell membrane
B cytoplasm
C DNA
D nucleus
Q2.
Scientists investigated one aspect of diet on the growth of six people.
When the six people were babies, they had different masses of calcium in their diets.
The height of each person was recorded when they were 10 and 18 years old.
The results are shown in the table.
(i) Complete the sentence by putting a cross ( ) in the box next to your answer.
The person with the most growth between 10 and 18 years had a daily diet containing
(1)
A 300 mg calcium per day
B 700 mg calcium per day
C 900 mg calcium per day
D 1100 mg calcium per day
(ii) Calculate the average rate of growth per year between the age of 10 and 18 for person 3.
(2)
answer = ......................................................cm per year
(iii) Describe the effect of the mass of calcium in the diet of a baby on their height at the age of 10
and 18.
(3)
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
(iv) Height can be illustrated by a normal distribution curve.
Give the name of this type of variation.
(1)
..............................................................................................................................................
Q3.
Eye colour inheritance
The diagram below shows the inheritance of eye colour in a family.
The allele for brown eyes is (B) and the allele for blue eyes is (b).
* Explain why two parents with the alleles BB and bb for eye colour are unlikely to produce offspring
with blue eyes.
You should draw a genetic diagram or Punnett square to help with your explanation.
(6)
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
..............................................................................................................................................
Q4.
The diagram below shows the inheritance of eye colour in a family.
The allele for brown eyes is (B) and the allele for blue eyes is (b).
(i) Give the phenotype of the mother.
(1)
..............................................................................................................................................
(ii) Give the genotype of Baby J.
(1)
..............................................................................................................................................
(iii) Complete the sentence by putting a cross ( ) in the box next to your answer.
Baby J is a
(1)
A
B
C
D
female with blue eyes
female with brown eyes
male with blue eyes
male with brown eyes
Mark Scheme
Q1.
Answer
(i)
(ii)
Acceptable
answers
gene (1) alleles (1)
Note: these MUST
be in the correct
order
D nucleus
Mark
(2)
(1)
Q2.
Question
Number
(i)
Question
Number
(ii)
Question
Number
(iii)
Question
Number
(iv)
Answer
Acceptable answers
Mark
D
Answer
Acceptable answers
(1)
Mark
substitution (1) (163
– 99)= 64
evaluation (1) (64) ÷
8=8
Answer
give two marks for
bald answer
Acceptable answers
(2)
Mark
A description
including three of
the following points
• at age 10 as the
mass of calcium
increased there is
little variation in
height (1) • at age
18 / when older /
later in life as the
mass of calcium
increased height
increases (1) • the
effect of calcium
appears to be
between 10- 18
(rather than at a
younger age) (1)
• correct
manipulation of data
(1)
Answer
‘as calcium
increases, height
increases’ give 1
mark
Acceptable answers
(3)
Mark
continuous
(variation)
(Allow ‘continues’ as
spelling error)
(1)
Q3.
Question
Indicative Content
Mark
Number
QWC
*
A Punnett square or genetic diagram showing the following gametes and offspring
If a Punnett square or genetic diagram is not drawn, then a full
description of this genetic inheritance is required • both parents will give one allele to the
possible offspring • one parent can only give a dominant/B allele • one parent can only
give a recessive/b allele • a dominant and recessive allele will result in heterozygous
offspring • offspring heterozygous for eye colour will have brown eyes • because the allele
for brown eyes is dominant over the allele for blue eyes • to be blue eyed, the offspring
must inherit one recessive allele(b) from each parent
(6)
Level
0
No rewardable content
1
1-2
• a limited explanation is provided by the
candidate of the inheritance with a genetic
diagram / Punnett square with either correct
gametes or offspring only • the answer
communicates ideas using simple language
and uses limited scientific terminology
• spelling, punctuation and grammar are
used with limited accuracy
2
3-4
• the genetic diagram / Punnett square is
correct for both gametes and offspring
• there is a basic outline of the inheritance
but the details of the inheritance are lacking,
• the answer communicates ideas showing
some evidence of clarity and organisation
and uses scientific terminology appropriately
• spelling, punctuation and grammar are
used with some accuracy
3
5-6
• the Punnett square / genetic diagram is
complete and accurate for both gametes and
offspring • the steps of inheritance of eye
colour are outlined clearly • the answer
communicates ideas clearly and coherently
uses a range of scientific terminology
accurately • spelling, punctuation and
grammar are used with few errors
Q4.
Question
Number
(i)
Question
Number
(ii)
Answer
Acceptable answers
Mark
brown (eyes)
Answer
Acceptable answers
(1)
Mark
Question
Number
(iii)
Answer
Accept homozygous
dominant
Acceptable answers
(1)
Mark
BB
B
(1)