Exam (elaborations)
OCR J257/01 Breadth in biology (Foundation Tier) GCSE (9–1) Biology B (Twenty First Century Science)
OCR J257/01 Breadth in biology (Foundation Tier) GCSE (9–1) Biology B (Twenty First Century Science)
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OCRJ257/01 Breadth in biology (Foundation Tier)
GCSE (9–1) Biology B
(Twenty First Century Science)
,PLEASE DO NOT WRITE ON THIS PAGE
1 (a) Write these structures in order of size.
Cell Chromosome Gene Nucleotide Nucleus Smallest .....................................
.....................................
.....................................
.....................................
Largest ..................................... [4]
(b) The table shows the number of chromosomes that different animals have in each body cell.
Animal Number of chromosomes in each body cell
Earthworm 36
Giant panda 42
Gorilla 48
Fly 8
Cat 38
Polar bear 74
Rat 42
Snail 24
Tiger 38
A student looks at the data and writes this conclusion:
"The larger the animal, the more chromosomes it has in each body cell."
Explain why the student is not correct.
Use two pieces of evidence from the table to support your answer.
...................................................................................................................................................
...................................................................................................................................................
, ...................................................................................................................................................
. [2]
2 Cocker spaniels are a breed of dog.
The colour of their fur is affected by the alleles of one of their genes. The black fur allele (B) is
dominant. The brown fur allele (b) is recessive.
1. Two cocker spaniels have a puppy.
o One of the parents has black fur and the alleles Bb.
o The other parent has brown fur and the alleles bb.
Calculate the probability that the puppy has black fur, using the Punnett square.
Probability = [4]
1. Complete the sentence to explain why many other fur colours and patterns are seen in
cocker spaniels.
Put a around the correct option.
ring
Many different fur colours and patterns are seen in cocker spaniels because most features are
the result of no genes / one gene / many genes.
[1]
3 Horses can develop a condition called laminitis.
The graph shows the number of laminitis cases in one area in one year.
20
15
Number of laminitis cases 10
5
0
JFMAMJJASOND
Month
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