partially protected hermaphrodites from male-induced demise (dashed lines) but did not detectably extend lifespan in the absence of males (solid lines) (significant and protective interaction by Cox proportional hazard model).Delm-2knockdown can extend lifespan in the absence of males in some but...
During amphimixis: A. meiosis occurs B. the ovum finishes meiosis II C. sperm become capacitated D. gametes are formed E. the male and female pronuclei fuse Undifferentiated sperm cells in the male embryo are called ___. Oogenesis in the female results in one functional gamete - the ovum...
Swamy, B. G. L. “The development of the male gamete in Cymbidium bicolor Lindl.,” Proc. Ind. Acad. Sci. , 1941, B 14 , 454–60.Swamy, B. G. L. (1941) The development of the male gamete inCymbidium bicolor Lindl. Proc. Ind. Acad. Sci. B 14: pp. 454-60...
What is the hormone secreted by Leydig cells needed for development of sperm; together with a secondary androgen formed dihydrotestosterone (DHT), controls the growth and development of male reproductive organs, secondary sex characteristics, and body gro In ma...
Evolutionary theory predicts that the breeding system could act as a major selective force on male gamete numbers. In highly promiscuous outcrossing species, a large number of male gametes should be produced because of male–male gamete competition, so reduced male gamete numbers are considered to ...
I. Male gamete is motile II. Male gametes are non-motile ) III. Male gametes are produced in large number IV. Male gametes are produced in small number V. There is a significant reduction in the number of eggs produced VI. In seeded plants non-motile male gametes are carried to female...
Since Fisher’s time, it has been realized that genes can sometimes influence the chromosome or gamete in which they find themselves so that the gamete will be more likely to participate in fertilization. If such a gene occurs on a sex-determining (X or Y) chromosome, then highly aberrant ...
b.Characteristic of or appropriate to this sex in humans and other animals:male hormones; male fashions. c.Consisting of members of this sex:a male choir. 2.Of or denoting the gamete that is smaller and more motile than the other corresponding gamete. Used of anisogamous organisms. ...
Since we are discussing the male cone, this option is not correct.- Microsporophyll: This is the correct term for the male gamete-producing structure in Pinus. The male cone is made up of a large number of microsporophylls.- Ligules: These are small outgrowths found at the base of ...
Mixis and syngamy, the second part of sexual reproduction, vary a lot in different eukaryote groups. Basically, two parental individuals are needed to conduct mixis, karyogamy and syngamy. Many evolutionary biologists put a lot of emphasis on the cost of “males”, as male individuals do ...