Sperm are produced in the(), and testosterone is secreted by the().A.interstitial (Leydig) cells, seminiferous tubulesB.seminal vesicles, Sertoli (sustentacular) cellsC.prostate, primary spermatocytesD.seminiferous tubules, interstitial (Leydig) cellsE.e
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Where Is Sperm Produced? Sperm are produced in the testicles. This happens within tiny tubes called seminiferous tubules. It’s an ongoing process, as the testicles make sperm nonstop. However, new sperm need time to mature before they’re ready to do their job of fertilizing an egg. That...
After controlling for male size, investment in sperm production decreases significantly according to the sequence obligatory multiple queen mating > multiple–single queen mating > single–double queen mating. Furthermore, the number of spermatozoa produced per male decreases significantly with reduction in...
The cytological basis of X chromosome meiotic drive or sex ratio (SR) has been reported for several species of Drosophila but not for other species. Here we describe how sperm development in the stalk-eyed fly, Cyrtodiopsis whitei, influences progeny sex
There is a good chance some will have babies that are different from what they wanted. And several might even be in danger.' Man Not Included was set up in June 2002 by former City headhunter John Gonzalez and is run from a first-floor office in Harley Street, London. He spotted a ...
The "sex-ratio" males produced a 15.6-fold higher frequency of nullo-XY sperm tha... G Cobbs - 《Journal of Heredity》 被引量: 0发表: 1992年 "When in the Foffspring of two different animal races one sex is absent, rare, or sterile, that sex is the heterozygous [heterogametic] sex...
sperm强调是精子，而semen则更强调是精液及富含精子生存所需要的营养物质。sperm：n. 精子；精液；鲸蜡油 复数 sperms或sperm semen：n. 精液；精子 n. (Semen)人名；(罗、土)塞门；(俄)谢苗 复数 semens或semina 英语字母与拉丁字母现代英语所使用的拼写字母，也是完全借用了26个字母。所谓“英语字母...
Sperm motility is the main problem for honeybees reproduction both in natural and inartificial insemination. Sperm produced only by sexually mature drone. Semen sampleswere colected from the drone by the massage technique, this consists ... L Tarliyah,A Boediono,D Walujo - 《Media Veteriner》 ...
Across species in both groups, the production of fertile males is associated with less than half of all spermatids not elongating normally in a spermatocyst bundle. We discuss the possibility that frequency-dependent selection on male fertility could stabilize the drive polymorphism in these unusual ...