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Steps resulting in the development of sex chromosomes

Steps resulting in the development of sex chromosomes

Figure 3. This figure runs figure 2 by prov, additionally the viability regime continues to be the exact same: v11 = v12 = 1.0, v22 = 0.5. For every single associated with three actions causing the synthesis of sex chromosomes, every line of the plot corresponds to a new worth of recombination involving the sex-determining locus the and the meiotic drive locus B which range from no recombination, r1 = 0, to free recombination r1 = 0.5. Every column corresponds to a new worth of drive in males which range from reasonable segregation,, to strong drive,.

Observe that A2 is absent from eggs since it is a dominant allele that is male-determiningfigure 2). The reduced the recombination price, the more the regularity for the male-determining allele A2 at equilibrium plus the more male biased the adult intercourse ratio (figure 3). The higher the drive in men, the more the regularity associated with the male-determining allele A2 and also the male bias associated with the adult intercourse ratio at balance (figure 3).

The populace at balance is a combination of males whoever intercourse is dependent upon the clear presence of allele A2 and homozygous A1 males and females whose intercourse is environmentally determined.

(d) Mutational step two: a female-determining allele invades additionally the male-biased sex ratio is maintained

Numerical analysis reveals that A3 invades if you find drive in men therefore the recombination between your sex-determining locus A and the drive locus B is not as much as free (r1; figures 2 and 3).

The low the recombination price, the reduced the frequency associated with female-determining allele A3 at equilibrium and also the greater the male bias associated with adult intercourse ratio (figure 3). The greater the drive in males, the lower the frequency associated with the female-determining allele A3 and the higher the male bias of this adult intercourse ratio at balance (figure 3).