In zebra finches, sperm velocity and morphology and hence reproductive success strongly depend on a specific mutation (an inversion) on one of the sex chromosomes, called Z. This was discovered by scientists of the Max Planck ...
Plants & Animals
Jul 17, 2017
0
135
In butterflies, sex is determined by chromosome differences between males and females. But unlike in humans with the familiar X and Y, in butterflies, it is the females that determine the sex of offspring.
Evolution
Jul 6, 2017
0
126
There are significant gaps in our knowledge on the evolution of sex, according to a research review on sex chromosomes from Lund University in Sweden. Even after more than a century of study, researchers do not know enough ...
Evolution
May 26, 2017
7
189
How do the two sexes come about? The answer to this question is more complex than one would expect. Though sexual reproduction invariably depends on the presence of male and female individuals, the genetic basis of sex determination ...
Plants & Animals
May 12, 2017
0
3
Where would we be without meiosis and recombination? For a start, none of us sexually reproducing organisms would be here, because that's how sperm and eggs are made. And when meiosis doesn't work properly, it can lead to ...
Biotechnology
Jan 23, 2017
0
75
The hamlet fish can be both the father and mother of its offspring – a characteristic that is helping researchers to understand why genes often undergo recombination more readily in one sex.
Cell & Microbiology
Jan 18, 2017
0
161
How new species are created is at the very core of the theory of evolution. The reigning theory is that physically separated populations of one species drift apart gradually.
Evolution
Jul 26, 2016
2
12
It turns out that the rigid "line in the sand" over which the human sex chromosomes—-the Y and X—- go to avoid crossing over is a bit blurrier than previously thought. Contrary to the current scientific consensus, Arizona ...
Biotechnology
Mar 23, 2016
1
90
During the last glaciation, a huge ice shield reached up to the region of today's Berlin. By the time it started to melt about 20.000 years ago, it enabled a gradual re-colonization of the northern latitudes by many plant ...
Plants & Animals
Feb 15, 2016
0
11
Each cell in a woman's body contains two X chromosomes. One of these chromosomes is switched off, because nobody can live with two active X chromosomes. Hendrik Marks and Henk Stunnenberg, molecular biologists at Radboud ...
Biotechnology
Aug 19, 2015
0
18
