Sexual selection is the theory proposed by Charles Darwin that states that the frequency of traits can increase or decrease depending on the attractiveness of the bearer.
Sexual intercourse --> coitus
(Science: biology, gynaecology) sexual connection per vaginam between male and female.
Origin: L. Coitio = a coming together, meeting ...
sexual dimorphism
two forms or types of a plant or animal because of its sex
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Sexually Transmitted Diseases Problem Set
This problem set is designed to increase students' knowledge of sexually transmitted diseases (STDs).
Several sexually-transmitted diseases (STDs), especially gonorrhea and infections by chlamydia can cause scarring and blocking of the tubes and are a major cause of infertility.
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Definition of Sexual :
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Sexual reproduction is a biological process by which organisms create descendants through the combination of genetic material. These organisms have two different adult sexes, male and female.
sexual reproduction -- A type of reproduction in which two parents give rise to offspring that have unique combinations of genes inherited through the gametes of the two parents. Sexual reproduction involves meiosis and syngamy.
Sexual Reproduction and Evolutionary Change
Variation
Later in this course, we will discuss how sexual reproduction acts to increase variation in populations by shuffling genes.
Sexual PCR
PCR amplification in which similar, but not identical, DNA sequences are reassembled to obtain novel combinations of related, but variable sequences.
Sexual Structures
Sperm pass through the vas deferens and connect to a short ejaculatory duct that connects to the urethra. The urethra passes through the penis and opens to the outside.
sexual dimorphism
(dy-mor-fiz-um)
A special case of polymorphism based on the distinction between the secondary sex characteristics of males and females.
sexual reproduction ...
sexual reproduction A system of reproduction in which two haploid sex cells (gametes) fuse to produce a diploid zygote. PICTURE ...
Sexual Differences in the SkullUntil the age of puberty there is little difference between the skull of the female and that of the male. The skull of an adult female is, as a rule, lighter and smaller, and its cranial capacity about 10 per cent.
Sexual selection 2
In this post I present two models of sexual selection and a paper that tests one of the predictions of both models.
Sexual reproduction. The process where two cells (gametes) fuse to form one hybrid, fertilized cell. See Asexual reproduction, Gamete, Hybrid.
Health, Sexual Attraction, Fertility, and Number of Surviving Offspring ...
sexual reproduction, reduction division, crossing over, kinetochore, microtubule
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sexual reproduction Reproduction involving fusion of gametes.
sexual selection Selection in relation to mating.
Sexual orientation is an independent parameter from gender identity. Those are two different things.
A sexual spore from certain fungus species in which spores are found in a sac called an ascus. Haploid spores found in the asci of Ascomycete fungi.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Anisogamy: Sexual reproduction in which one sex produces sex cells much larger (egg) than those of the other (sperm).
copulatio - sexual coupling] The sexual act of a male and female, of the same species, coming together for the purpose of delivering and receiving sperm respectively.
The panel on human sexuality focused largely on press coverage of a possible genetic basis for homosexuality.
Animal - kingdom composed of multicellular organisms divided into two divisions: vertebrates and invertebrates, who obtain their food from external sources and reproduce sexually or asexually ...
Well, this is a really important part of human biology and the biology of many other organisms that go through sexual reproduction. Basically, here's the problem: You've got a certain number of chromosomes; we humans have 46.
MEIOSIS - IT'S FOR SEXUAL REPRODUCTION
What are the big ideas here? There are two cell divisions. Mitosis has one division and meiosis has two divisions. You still have to remember PMATI, but now you do it twice.
Continuation of species or breed, sexually or through cell rupture, cell division, budding, spore formation, conjugation or parthenogenesis.
Related Terms:
Species ...
A cross made to transfer alleles between two sexually isolated species by first transferring the alleles to an intermediate species that is sexually compatible with both.
Related Terms:
Crossing ...
Conjugation a type of sexual reproduction in which the contents of the male gamete cell go over into and unite with the female cell
(con = with‚ together; juga = a yoke; -tion = process of‚ action of) ...
amplexus - [Latin, an embracing] form of sexual reproduction seen in frogs wherein the male grasps the female from behind and externally fertilizes the eggs as they are deposited.
catkin. A spikelike cluster of unisexual flowers, e.g., the male flowers of walnut.
cauda. A process resembling a tail.
In instances of sexual reproduction, the cellular process of meiosis is first necessary so that haploid daughter cells, or gametes, can be produced.
Androgens A class of steroid hormones, exemplified by testosterone, that are responsible for the development of male secondary sexual characteristics; synthesized by the testes.
Angstrom (Ĺ) A unit of length equal to 10-10 meter.
workers - any of a class of sterile or sexually imperfect female ants, bees, wasps, etc. that do general or specialized work (Webster) ...
Fertilization: The joining or fusion of the male gamete (sperm) and the female gamete (egg) to form a zygote during sexual reproduction. See also gamete, zygote.
Fitness: The ability to survive to reproductive age and produce viable offspring. Fitness also describes the frequency distribution of reproductive success for a population of sexually mature adults.
during meiosis in which chromosome partners, one inherited from each parent, physically swap sections with one another. This creates hybrid chromosomes that are a patchwork of the original pair. Crossing over occurs in species that reproduce sexually ...
Klinefelter syndrome -- an endocrine condition caused by a an extra X-chromosome (47,XXY); characterized by the lack of normal sexual development and testosterone, leading to infertility and adjustment problems if not detected and treated early.
 See also: Trans, Organ, Human, Biology, Plant
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