The generic term polyploid is often used to describe cells with three or more chromosome sets. Gametophytic apomixis. Padoa, E. Gited from Padoa. Studies on the sexuality of Amphibia.
There is some conventional wisdom that in organisms with genetically determined sex, sex-ratios should be around Male:Female. Search term. If the larva is attracted to a female's proboscis, it travels along the tube until it enters the female's body. A sex chromosomealso referred to as an allosomeheterotypical chromosomeor heterochromosome  or idiochromosome  is a chromosome that differs from an ordinary autosome in form, size, and behavior.
In turtles and crocodiles, sex is determined by the temperature of the surrounding environment at a specific period in the development of a fertilized egg. If only one gene in the pair is abnormal, the disease does not occur, or is mild. Sign up for our email newsletter.
Copulation is often forced on females by males, and females can be vulnerable to deadly harm as a result. Sex chromosomes have evolved independently across many plant groups. To understand one such theory, you can take the following scenario into consideration: a DNA sequence that is concerned with the creation of a male-trait is regulated by a regulatory DNA sequence.
This suggests that the W chromosome is essential in female determination in some species ZZWbut not in others Z0.
Tetraploids can be reconstituted from the diploids, for example by somatic fusion. For example, most animals are diploid and produce haploid gametes. In the Teleosts such topographical l o c a l i z a t i o n i s not apparent since the t e s t i c u l a r network does not pass through the kidney.