Question

Problem I

A series of two-point crosses were carried out among seven loci (a, b, c, d, e, f, and g), producing the following recombination frequencies. Map the seven loci, showing their linkage groups, the order of the loci in each linkage group, and distances between the loci of each linkage group.

Loci %    Recombination   Loci %    Recombination

a - b    50    c - d   50

a - c    50   c - e   26

a - d    12    c - f   50

a - e    50    c - g   50

a - f    50    d - e   50

a - g    4    d - f   50

b - c    10   d - g   8

b - d    50    e - f   50

b - e    18    e - g   50

b - f    50    f - g   50

b - g    50

Answer 1

If the genes are unlinked recombinant percent is 50% and it cannot exceed beyond that.

If the genes are linked recombinant percent is less than 50% .Genes with recombination frequencies less than 50% are present in the same chromosome (linked). Two genes that undergo independent assortment, indicated by a recombination frequency of 50 percent, are either on non homologous chromosomes or are located far apart in a single chromosome.

Each gene has its own unique locus at a particular site within a chromosome

1% recombination = 1 map unit (m.u.) = 1 cM (centiMorgan entiMorgan)

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