New PDF release: Sex Chromosomes

By Ursula Mittwoch (Auth.)

ISBN-10: 1483232689

ISBN-13: 9781483232683

Show description

Read or Download Sex Chromosomes PDF

Best developmental biology books

HOX gene expression - download pdf or read online

The examine of Hox genes is important not just in exploring the enigma of homeosis but in addition in realizing general improvement on the primary molecular point. "Hox Gene Expression" begins with the superb discovery of the homeobox twenty-three years in the past and follows the intriguing direction thereafter of a sequence of breakthroughs in Genetics, improvement and Evolution.

Nutrition in Early Life - download pdf or read online

The booklet of the dept of overall healthiness White Paper "The overall healthiness of the state" (1992) and "Our more fit kingdom" (1998) gave emphasis to the significance of dietary future health of the kingdom in any respect a while. it really is transparent that the fulfillment of particular goals for being pregnant and infancy as set out within the White Paper will contain the learning of all health and wellbeing care execs in meals schooling.

Download e-book for iPad: Genetic Transformation Systems in Fungi, Volume 1 by Marco A. van den Berg, Karunakaran Maruthachalam

Numerous diverse transformation innovations were constructed through the years and comfortably proven to be decisive tools in fungal biotechnology. This ebook will hide the fundamentals in the back of the main accepted transformation equipment, in addition to linked instruments and strategies. each one bankruptcy will supply protocols besides examples utilized in laboratories around the world.

Toshio Nakanishi, Roger R. Markwald, H.Scott Baldwin,'s Etiology and Morphogenesis of Congenital Heart Disease: From PDF

This quantity makes a speciality of the etiology and morphogenesis of congenital center illnesses. It reports intimately the early improvement and differentiation of the guts, and later morphologic occasions of the cardiovascular procedure, protecting a variety of subject matters comparable to gene features, development elements, transcription components and mobile interactions which are implicated in cardiac morphogenesis and congenital middle ailment.

Extra info for Sex Chromosomes

Example text

It is clear that the Y-chromosome must be strongly male-determining. In Warmke's strains, a few hermaphrodite blossoms could be found in addition to the male ones, whereas in Westergaard's material all such flowers were entirely male. 0 Male (occasional hermaphrodite blossom) 4A X X X Y Y 2A 3A 4A 4A 3A 4A XXY ) XXY ) XXY ) XXXXYY) XXXY XXXY 4A X X X X Y ° From Warmke (1946). 0 Male (occasional hermaphrodite blossom) Hermaphrodite (occasional male blossom) 47 III. F L O W E R I N G PLANTS these plants was slightly stronger.

It is clear that the Y-chromosome must be strongly male-determining. In Warmke's strains, a few hermaphrodite blossoms could be found in addition to the male ones, whereas in Westergaard's material all such flowers were entirely male. 0 Male (occasional hermaphrodite blossom) 4A X X X Y Y 2A 3A 4A 4A 3A 4A XXY ) XXY ) XXY ) XXXXYY) XXXY XXXY 4A X X X X Y ° From Warmke (1946). 0 Male (occasional hermaphrodite blossom) Hermaphrodite (occasional male blossom) 47 III. F L O W E R I N G PLANTS these plants was slightly stronger.

Initial germ cells are called spermatogonia and they divide mitotically for many generations. Following the last mitosis the spermatogonia duplicate their DNA, grow in size, and their chromosomes associate in pairs. The cells are now called primary spermatocytes. Since they contain the duplicated amount of DNA they may technically be regarded as tetraploid. The primary spermatocyte then undergoes the first meiotic division and gives rise to two secondary spermatocytes. Then the second 32 2 . MITOSIS, MEIOSIS, AND GAMETE FORMATION meiotic division occurs, giving rise to four spermatids, each containing the haploid number of chromosomes.

Download PDF sample

Sex Chromosomes by Ursula Mittwoch (Auth.)


by Kenneth
4.5

Rated 4.60 of 5 – based on 31 votes