Hi,

Can anyone confirm my answer here.. I need to determine familial relationship

Body 1 Body 2 Body3

Locus 1 14,19 16,18 14,18
Locus 2 15,21 18,18 17,21
Locus 3 11,11 12,13 11,12
Locus 4 18,19 18,24 18,23
Locus 5 13,14 14,15 12,14
Locus 6 29,29.2 29,31.2 29,31.2
Locus 7 13,17 16,16 14,17
Locus 8 13,13 12,14 13,15
Locus 9 9,9.3 6,7 9,9.3
Locus10 22,23 19,24 23,24

XX XY XY

My answer is Body, 1 and 3 are related Body 1 is the mother of 3 as it contains one of the two alleles found in body 3.

Body 2 cannot be related to or be the father of body 3 he does not share the common loci throughout the DNA profile

Is this right ? Body 2 cannot be the father can he ?? He does share some-but not all the alleles with body 3. Body 1 shares one common allele throughout the DNA profile

My assumption is that unless the allele are present then there is no relationship it is pure chance ?

Thank you !!!!!!!!

To determine familial relationships using the given DNA profiles, you can compare the alleles at each locus between the two bodies.

In this case, let's analyze the relationship between Body 1 and Body 3. You correctly noted that Body 1 and Body 3 share one common allele (14,18) at Locus 1. Based on this, it is reasonable to assume that Body 1 could be the mother of Body 3, as a child inherits half of their DNA from each parent.

However, when considering the relationship between Body 2 and Body 3, you mentioned that Body 2 does not share all the alleles throughout the DNA profile with Body 3. This suggests that Body 2 is unlikely to be the father of Body 3, as a father would typically share more alleles with their child.

Your assumption that the presence of alleles is necessary for a relationship is correct. Familial relationships can be determined by analyzing shared alleles at multiple loci across the DNA profile.

To summarize, based on the information provided, it is reasonable to conclude that Body 1 could be the mother of Body 3, but it is unlikely that Body 2 is the father of Body 3 given their differing DNA profiles.