Search Results for: sex
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
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
Chromosomes X and Y and Sex Determination
Reviewed by: Mary Anne Clark, Ph.D. In humans, the normal chromosome complement is 46, consisting of 22 pairs of... Read More
Sexual selection
What is Sexual Selection? The definition of sexual selection is very interesting in biological terms. The sexual selection... Read More
First time! Human blood cell turned into a young sex cell
In essence, our body consists of two major types of cells – one group involved directly in reproducing sexually (called... Read More
Sex linkage
Definition noun, plural: sex linkages A condition in which a trait or a phenotype manifesting apparently more frequently in... Read More
Sex chromosome
Definition noun, plural: sex chromosomes A type of chromosome in the genome that is involved in the determination of the sex... Read More
Sex steroid
Definition noun, plural: sex steroids A steroid hormone that when bound to specific sex hormone receptor becomes active and... 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
Sexual reproduction
Sexual reproduction is a mode of reproduction involving the fusion of haploid female gamete (egg cell) and haploid male... Read More
Homogametic sex
Definition noun The sex of a species possessing similar sex chromosomes Supplement In humans, the homogametic sex is the... Read More
Sex determination
Definition noun (1) (embryology) The developmental process in which the sex of a bipotential embryo is fixed or determined... Read More
Sex-linked gene
Definition noun, plural: sex-linked genes A gene located in the sex chromosome. Supplement In humans, the sex... 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
Sex-linked
Definition adjective (1) Pertaining to a gene located in the sex chromosome (especially an X chromosome). (2) Pertaining to... Read More
Asexual reproduction
Asexual Reproduction Definition What is asexual reproduction? Asexual reproduction is a type of reproduction that does not... Read More
Sex-linked disorder
Definition noun, plural: sex-linked disorders A genetic disorder caused by or linked to gene(s) located in the sex... Read More
Hermaphrodite
We all know that typically living organisms are divided into two main categories of sex-based on their biological structure.... Read More
Sex hormone
Definition noun A hormone that is secreted by gonads and is involved in the regulation of sexual functions, such as the... 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
Sexual dimorphism
Sexual Dimorphism Definition Sexual dimorphism refers to the morphological differences (in form or appearance) between... Read More
Sex reversal
Definition noun Change of sexual identity in animals as influenced by an environmental variable, also by surgical or... Read More
Haplodiploidy
Definition noun A biological system of sex determination as observed in the Hymenopteran species (e.g. ants and bees) where... Read More
Chromosome
Chromosomes Definition Chromosomes are thread-like structures present in the nucleus of plant and animal cells. Chromosomes... Read More
X chromosome
Definition noun, plural: X chromosomes A mammalian sex chromosome which typically occurs in two in females and one in... Read More
Sexually transmitted disease
Definition noun, plural: sexually transmitted diseases (pathology) A disease that is primarily contracted through sexual... Read More
Sex factor
Definition noun A DNA sequence or plasmid that confers certain bacteria the ability to produce a sex pilus for conjugation... 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
Testosterone
Definition noun, plural: testosterones A steroid hormone with a chemical formula of C19H28O2, and is regarded as the primary... Read More
Y-linked inheritance
Definition noun (genetics) Inheritance for genes on the Y chromosome Supplement Sex chromosomes are not only relevant... Read More