Only two sex forms but multiple gender variants: How to explain?

Only two sex forms but multiple gender variants: How to explain?

Are sex and gender interchangeable terms? In classical biology, both are sometimes but not always used on an equal basis for some groups of animals. However, for our own species the Homo sapiens, they are not. A major question is why are there only two types of gametes (sperm- and egg cells), two types of sex steroids, (androgens and estrogens in vertebrates, and two types of ecdysteroids in in...

How Can Gender Discrimination Explain Fertility

This paper focuses on the interaction between gender discrimination and household decisions. It develops a model with endogenous fertility, endogenous labor supply and endogenous size of government spending. Family policies which concern childcare services are assumed to reduce the time that parents spend on their children. The model shows that gender discrimination may explain differences in h...

Sex Determination: How Worms Count to Two

A century ago, Bridges proposed that male genes on the autosomes and female genes on the X chromosome compete to determine sexual identity. New genetic and molecular studies establish Caenorhabditis elegans as the first animal known to use this mechanism.

Biomedicine. Lowering LDL--not only how low, but how long?

How to Explain Mistakes

Usually we teach formal methods relying for a large part on one kind of reasoning technique about a formal model. For instance, we either use formal proof or we use model-checking. It would appear that it is already hard enough to learn one technique and having to cope with two puts just another burden on the students. This is not our experience. Especially model-checking is easily used to comp...