Search Results for: male
Hermaphrodite
We all know that typically living organisms are divided into two main categories of sex-based on their biological structure.... Read More
Y chromosome
Y chromosome Definition The Y chromosome constitutes one member of the pair of sex chromosomes within an organism, a common... Read More
Sex Reversal – When Males Grew Ovaries Instead of Testes
Summary: Sex reversal is not unusual in some animals, especially in invertebrates. As for the vertebrates, there are... Read More
Sexual selection
What is Sexual Selection? The definition of sexual selection is very interesting in biological terms. The sexual selection... Read More
On Mate Selection Evolution: Are intelligent males more attractive?
A study published in Science on January 11 seems to be the first to lay empirical evidence that concur with Charles Darwin's... Read More
Reproductive system
What is the Reproductive System? The reproductive system of an organism is the biological system made up of all the... Read More
Spermatogenesis
Spermatogenesis Definition Spermatogenesis is the biological process of producing sperm cells. It occurs in the male gonad... Read More
The Amazing Spider Dads
Humans are not the only fathers capable of giving it all for the sake of their progeny. The animal kingdom is teeming with... Read More
Sexual reproduction
Sexual reproduction is a mode of reproduction involving the fusion of haploid female gamete (egg cell) and haploid male... Read More
Parthenogenesis
To reproduce, by definition, means to produce new offspring. The process is referred to as reproduction, which is one of the... Read More
Pollen Grain
What are Pollen Grains? Plants are unique structures and so they carry out mechanisms in special ways. Fertilization in... Read More
Sex-linked trait
Definition of Sex-Linked Traits A sex-linked trait is an observable characteristic of an organism that is influenced by the... Read More
Spermiogenesis
Spermiogenesis Definition Spermiogenesis is the stage of spermatogenesis wherein the spermatids differentiate into mature... Read More
Men could go extinct? Y chromosome disappearing slowly
Hold on to your seats, gentlemen -- the male chromosome (Y chromosome) disappearing at a certain rate could absolutely be... Read More
Seed Plants
There are two main subdivisions of seed plants—the ones without covered seeds, the gymnosperms, and the ones with covered... Read More
Angiosperm
Angiosperms Definition What is an angiosperm? An angiosperm is a plant that produces flowers. The angiosperms, also... Read More
Asexual reproduction
Asexual Reproduction Definition What is asexual reproduction? Asexual reproduction is a type of reproduction that does not... Read More
Human Reproduction
Terminology and Concepts Primary reproductive organs are called gonads - testes in the male and ovaries in the female.... Read More
Reproduction
Reproduction Definition Reproduction is a biological phenomenon of producing offspring/s. i.e. more of its kind. Depending... Read More
SENI Biometric Analysis on the extinct Scincidae species: Macroscincus coctei (underlined)
Brian L. Schnirel Leeway Corucia Research Center (LCRC) Courtesy: Polyphemos (2004) Introduction: It has been... Read More
Sex-determining Region Y gene
Definition noun The gene that codes for the SRY protein, which is associated with the testicular development in many male... Read More
Genotypic ratio
Genotypic Ratio Definition To understand 'Genotypic ratio', let us first understand the terms: 'Genotype' and 'Phenotype'.... Read More
Sporophyte
Sporophyte Definition What is a sporophyte? Accordingly, the sporophyte is the plant generation that produces spores. To... Read More
Embryology
Embryology Definition Embryology is a branch of biology that deals with the topics concerning gamete formation... Read More
New Zealand’s Unique Fauna
By: Maria Victoria Gonzaga In the previous lesson, we learned about the high biodiversity of New Zealand and how... Read More
Gynaecophore
Definition noun, plural: gynecophores A receptacle, often in the ventral body, of certain adult male animals (dioecious... Read More
Chromosome
Chromosomes Definition Chromosomes are thread-like structures present in the nucleus of plant and animal cells. Chromosomes... Read More
Thanatosis – Faking Death To Escape Doom
Thanatosis -- pretending to be dead -- is one of the best strategies that certain wild animals came up with in order to... Read More
Molecular Basis of Temperature-Dependent Gender of Red-Eared Slider Turtle
Imagine a child inside a womb with a sex yet to be decided not by the pair of sex chromosomes but by the ambient temperature... Read More
Ejaculation
Definition noun (biology) The act of ejecting or expulsion, as of the expulsion of semen from the male genital tract in... Read More