Inglise keel unit 5 answers
A no (coat colour), gene / allele, on Y chromosome
male cats, XY / only have one X chromosome;
males have only one (coat colour) allele / cannot have two (coat colour)
alleles;
need black and orange alleles for tortoiseshell colour; 2
r r w w
(b) parental genotypes C C × C C ;
r w
gametes C , C ;
F1 genotypes and phenotypes 1 mark:
r w
F1 genotypes (all) C C
F1 phenotypes (all) pink;
F2 genotypes and phenotypes 1 mark:
r w r w
gametes C , C C , C ;
r r r w r w w w
F2 genotypes C C C C C C C C
F2 phenotypes red pink (pink) white;
F2 ratio 1:2:1;
accept other symbols if key given.
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