a) In horses, chestnut ( ‘HBHB’ ) and white ( ‘HWHW’ ) coat colours represent ho
ID: 146536 • Letter: A
Question
a) In horses, chestnut (‘HBHB’) and white (‘HWHW’) coat colours represent homozygous genotypes constituted by autosomal alleles that are codominant. Heterozygous horses have a blend of both colours, which appears golden tan, and is called palomino (‘HBHW’). A horse stud farm in Wagga has 100 chestnut, 45 palomino and 5 white horses. Using Chi-square analysis, determine if the horse population is at Hardy-Weinberg equilibrium.
b) Explain how expectations have been derived
c) Explain your interpretation
Explanation / Answer
a)Expected number of genotype Let the frequency of HB allele = p frequency of HW allele = q Now from given population, p2 = 95/150 = 0.6333 q2 = 5/150 = 0.033 2pq = 50/150 = 0.333 For codominant (.b &c ).Hardy-Weinberg equation p²+2pq+q² = 1. Based on this equation 0.633+0.333+0.033=0.999(approximately 1)...equilibrium maintainance
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