Platinum color in foxes is produced by a heterozygous genotype involving interac
ID: 192748 • Letter: P
Question
Platinum color in foxes is produced by a heterozygous genotype involving interactions between a gene for silver and a codominant lethal gene. The silver gene in the homozygous state produces silver color, the lethal homozygote usually dies during early embryonic development.
a). Calculate the frequency of the silver gene among a group of fozes where 40% are silver and 60% are platinum
b). Using the frequencies calculated in part (a), estimate the percentage of the two colors that would be expected in the litters with random mating
c). Calculate the new frequency for the gene for silver
d). Provide an explanation for the change in frequencies
Explanation / Answer
a) 40% = silver (SS)= p2
60% = platinum (SL)=pq
frequency of silver color gene= p2 +(1/2 pq) =40+30=70%
b) p=0.7 (according to above calculated percentage)
p+q=1
so, q= 1-0.7 =0.3
49% silver color (pp=ss) & 42% platinum color (pq==SL)
c) 49% is new frequency of silver color.
d) because in gene pool random mating change the frequency.
p (0.7) q(0.3) p(0.7) pp(0.49) (0.21) q(0.3) (0.21) (0.09)