Describe the mechanism of sex determination in the two forms of automictic parthenogenesis
What will be an ideal response?
Answer: Essentially, sex determination depends on which of the sexes is homogametic. In thelytoky, the homogametic condition (XX) is female, and therefore the parthenogenetically produced offspring must also be homogametic (XX) and female. In arrhenotoky, the heterogametic (WZ) condition is female: Since fusion of the mature ovum with the second polar body simply reunites the chromatids derived from a single parent chromosome, all offspring must be homogametic (ZZ or WW) and either male (ZZ) or nonviable (WW).
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