Page 45 - CB1.3 Genetic Varation sciPAD
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CB 1.3 GENETIC VARIATION
TRACKING GENES
End of Chapter Review Questions
1. Trenrose Peonies in Central Hawke’s Bay grow peony flowers.
They have carried out a number of breeding experiments on
their flowers and have found that red colour (R) is dominant
to white (r) colour in peonies.
After a cross between two peony plants, it was found that
50% of the offspring produced red flowers and 50% of the
offspring produced white flowers. Use a Punnett square to
show the likely genotypes of the parent plants.
The genotypes of the parents are and .
(c) Use the example of peony flower colour to describe the difference between
‘phenotype’ and ‘genotype’.
Phenotype is:
Genotype is:
2. In the kiwi, sex is determined by two chromosomes. Unlike mammals such as humans, it is
the male kiwi that has two of the same type of sex chromosome. Male birds have two Z
chromosomes and female birds have a Z and a W chromosome.
Complete the Punnett square below to show the possible combinations of sex chromosomes
that could form in a fertilised egg.
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