[问答题]
In Mongolian horses (
pvpc l0wg k9av ,pveua21.,+nEquus przewalskii),
zw(wrl jhln-j 09j:u1hv. z s3cl6hb.fur colour is determined by a number of genes. Brown colour (B) is dominant to sandy colour (b) and an ombre (two ton
b h1nljz-s.j9h6 zww:vl3r0j .c ul (he) colour (P) is dominant to one tone (p).
1.A homozygous sandy ombre male horse is crossed with a heterozygous horse for both traits. Draw a Punnett square to show the potential results of this cross.
2.Identify the possible genotype recombinations, after fertilisation, from the cross in part (a).
3.In pigs, the curly tail is dominant to the straight tail, and pink skin is dominant to black skin. On a pig farm, the resulting phenotypes from double-heteroygous genotype breeding were recorded. The chi-square value for the phenotypes of the offspring was calculated and the result was 340.6.
The table below shows the degrees of freedom (D.f.) and critical values at a significance level (p) of 0.05 (5%) for a chi-squared test.
Discuss whether the genes for skin colour and tail shape in pigs are linked or unlinked.
