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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