Class Hirudinomorpha
... Genital segments each posses a pair of gonoducts (sperm ducts or oviducts), which open to the ventral surface Female genital segments have ventral openings that lead to seminal receptacles (store sperm prior to fertilization) ...
... Genital segments each posses a pair of gonoducts (sperm ducts or oviducts), which open to the ventral surface Female genital segments have ventral openings that lead to seminal receptacles (store sperm prior to fertilization) ...
Lecture
... – clustering of animals in the same area for fertilization = spawning – when not synchronized within a population – mating pairs will undergo courtship behaviors to stimulate release of gametes – e.g. frogs – external fertilization with courtship behavior – locates breeding sites and potential mates ...
... – clustering of animals in the same area for fertilization = spawning – when not synchronized within a population – mating pairs will undergo courtship behaviors to stimulate release of gametes – e.g. frogs – external fertilization with courtship behavior – locates breeding sites and potential mates ...
- Toolbox Pro
... The amnion contains the amniotic fluid. This fluid provides a water environment, protects the embryo from shock, and prevents adhesion of the embryonic tissues to the shell. The yolk sac surrounds the yolk. Blood vessels which penetrate the yolk sac transport food to the developing embryo. The ...
... The amnion contains the amniotic fluid. This fluid provides a water environment, protects the embryo from shock, and prevents adhesion of the embryonic tissues to the shell. The yolk sac surrounds the yolk. Blood vessels which penetrate the yolk sac transport food to the developing embryo. The ...
Frog Dissection Questions
... 8. Suppose in a living frog the spinal nerve extending to the leg muscle were cut. What ability would the frog lose? Why? ...
... 8. Suppose in a living frog the spinal nerve extending to the leg muscle were cut. What ability would the frog lose? Why? ...
S1 – Body Systems Summary Notes
... All of the cells in our body need food so that they can do their jobs and keep us functioning. Our bloodstream acts as a transportation system to carry food around the body to the places it is needed. ...
... All of the cells in our body need food so that they can do their jobs and keep us functioning. Our bloodstream acts as a transportation system to carry food around the body to the places it is needed. ...
kurtis
... for sperm before they leave via the vas deferens leading to the urethra. A vasectomy prevents sperm from leaving the body and is an effective method of birth control. The ejaculatory duct allows the movement of sperm and semen into the urethra. A sphincter regulates the voiding of urine from the bl ...
... for sperm before they leave via the vas deferens leading to the urethra. A vasectomy prevents sperm from leaving the body and is an effective method of birth control. The ejaculatory duct allows the movement of sperm and semen into the urethra. A sphincter regulates the voiding of urine from the bl ...
Part 2-PP File - shscience.net
... 1. Why is sexual reproduction advantageous over asexual reproduction? 2. What structures make up the male and female reproductive systems? 3. How do offspring of sexually-reproducing organisms receive their genetic information? ...
... 1. Why is sexual reproduction advantageous over asexual reproduction? 2. What structures make up the male and female reproductive systems? 3. How do offspring of sexually-reproducing organisms receive their genetic information? ...
Answers to Mastering Concepts Questions
... Asexual reproduction produces identical clones of one individual and is advantageous in an environment that does not change much over time. Sexual reproduction requires two parents, each contributing to the DNA of the offspring. The genetic diversity in a population of sexually reproducing organisms ...
... Asexual reproduction produces identical clones of one individual and is advantageous in an environment that does not change much over time. Sexual reproduction requires two parents, each contributing to the DNA of the offspring. The genetic diversity in a population of sexually reproducing organisms ...
Sexual Reproduction
... egg cell that has had the nucleus removed. 100% of the genetic information is from a single parent. Accomplished with plants, sheep, pigs, and monkeys. Cuttings ...
... egg cell that has had the nucleus removed. 100% of the genetic information is from a single parent. Accomplished with plants, sheep, pigs, and monkeys. Cuttings ...
Reproduction and Development
... Ovulation • When follicle has completely matured, the ovum is released – Ovulation • Follicle literally ruptures – Ovum is swept from the surface of the ovary into the opening of one of the two Fallopian tubes – Ovum moves through the fluid-filled Fallopian tubes, pushed along by cilia » Egg can b ...
... Ovulation • When follicle has completely matured, the ovum is released – Ovulation • Follicle literally ruptures – Ovum is swept from the surface of the ovary into the opening of one of the two Fallopian tubes – Ovum moves through the fluid-filled Fallopian tubes, pushed along by cilia » Egg can b ...
Chapter 31
... ASEXUAL AND SEXUAL REPRODUCTION • Parthenogenesis is a special type of reproduction in which offspring are produced from unfertilized eggs. • For example, in honeybees, a queen mates only once and stores sperm. • If no sperm are released, the eggs develop into drones, which are male. • If sperm are ...
... ASEXUAL AND SEXUAL REPRODUCTION • Parthenogenesis is a special type of reproduction in which offspring are produced from unfertilized eggs. • For example, in honeybees, a queen mates only once and stores sperm. • If no sperm are released, the eggs develop into drones, which are male. • If sperm are ...
Sexual reproduction in Human beings
... and give the functions of testes, scrotum, sperm ducts, prostate gland, urethra and penis Identify on diagrams of the female reproductive system and give the functions of ovaries, oviducts, uterus, cervix and vagina Compare male and female gametes in terms of size, numbers and mobility Describe the ...
... and give the functions of testes, scrotum, sperm ducts, prostate gland, urethra and penis Identify on diagrams of the female reproductive system and give the functions of ovaries, oviducts, uterus, cervix and vagina Compare male and female gametes in terms of size, numbers and mobility Describe the ...
Functions of Female Reproductive Organs
... – Where sperm are carried to the urethra and then out of the body ...
... – Where sperm are carried to the urethra and then out of the body ...
Human Reproduction Reproduction
... Reproduction ensures the survival of a species. Sexual reproduction produces offspring with new and unique characteristics that may increase their chance of survival. In advanced forms of reproduction, there are 2 types of gametes (sex cells). These are sperm, produced by the male, and eggs (ovum), ...
... Reproduction ensures the survival of a species. Sexual reproduction produces offspring with new and unique characteristics that may increase their chance of survival. In advanced forms of reproduction, there are 2 types of gametes (sex cells). These are sperm, produced by the male, and eggs (ovum), ...
Ovary
... The zygote moves down the fallopian tube toward the uterus and divides many times: CLEAVAGE With in the next 2 weeks, the zygote will become an EMBRYO, and continue to divide The embryo implants itself into the uterine lining and GASTRULATES (hollows out) The embryo starts to form distinctive specia ...
... The zygote moves down the fallopian tube toward the uterus and divides many times: CLEAVAGE With in the next 2 weeks, the zygote will become an EMBRYO, and continue to divide The embryo implants itself into the uterine lining and GASTRULATES (hollows out) The embryo starts to form distinctive specia ...
Micro Lab Unit 1 Flashcards
... body of an existing one as a result of unequal division of the organism? 38) What is the breaking of the body into several pieces, each of which develops into a complete adult? 39) What is the regrowth of lost body parts? 40) If conditions change and become unfavourable, what can happen to the popul ...
... body of an existing one as a result of unequal division of the organism? 38) What is the breaking of the body into several pieces, each of which develops into a complete adult? 39) What is the regrowth of lost body parts? 40) If conditions change and become unfavourable, what can happen to the popul ...
Annelida
... Sperm exchange between mating earthworms: • Sperm from testis stored in, and later released from, seminal vesicles • Sperm from other worm stored in seminal receptacles • After separation, sperm from other worm used to fertilize eggs from the ovary ...
... Sperm exchange between mating earthworms: • Sperm from testis stored in, and later released from, seminal vesicles • Sperm from other worm stored in seminal receptacles • After separation, sperm from other worm used to fertilize eggs from the ovary ...
Human Body Systems
... Levels of Organization The levels of organization in a multicellular organism start with the individual cell. A group of similar cells that do the same function (job) are tissues. Similar tissues form organs that do a complex function for example the kidneys filter urea from the blood. Organs work ...
... Levels of Organization The levels of organization in a multicellular organism start with the individual cell. A group of similar cells that do the same function (job) are tissues. Similar tissues form organs that do a complex function for example the kidneys filter urea from the blood. Organs work ...
Human Biology 4.3
... •The sperm is a single cell with a head and a tail. •The head is filled with chromosomes. •The tail functions as a whip to make the sperm mobile. •Sperm travel from the testes, through several different structures of the reproductive system. •While they travel, the sperm mix with fluids called semen ...
... •The sperm is a single cell with a head and a tail. •The head is filled with chromosomes. •The tail functions as a whip to make the sperm mobile. •Sperm travel from the testes, through several different structures of the reproductive system. •While they travel, the sperm mix with fluids called semen ...
Rat Body Systems INTEGUMENTARY (Outer body covering) Skin
... TYMPANIC MEMBRANE (eardrum) inside head; 3 small bones in inner ear EYES see color/good DEPTH PERCEPTION (eyes on front of head) ENDOCRINE: The endocrine system in mammals is the most complex. The THYROID GLAND regulates metabolism, but many others such as the PITUITARY, ADRENAL, and PARATHYROID GLA ...
... TYMPANIC MEMBRANE (eardrum) inside head; 3 small bones in inner ear EYES see color/good DEPTH PERCEPTION (eyes on front of head) ENDOCRINE: The endocrine system in mammals is the most complex. The THYROID GLAND regulates metabolism, but many others such as the PITUITARY, ADRENAL, and PARATHYROID GLA ...
Sexual Reproduction
... - few eggs produced - protected - could have either internal (mammals) or external (birds) development External Fertilization - fertilization occurs outside the body of the female ...
... - few eggs produced - protected - could have either internal (mammals) or external (birds) development External Fertilization - fertilization occurs outside the body of the female ...
Sperm competition
Sperm competition is a term used to refer to the competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction. Competition can occur when females have multiple potential mating partners. Greater choice and variety of mates increases a female's chance to produce more viable offspring. However, multiple mates for a female means an individual male has decreased chances of producing offspring.Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase males' chance of reproductive success. Sperm competition results in a sexual conflict of interest between males and females. Males have evolved several defensive tactics including: mate-guarding, mating plugs, and releasing toxic seminal substances to reduce female re-mating tendencies to cope with sperm competition. Offensive tactics of sperm competition involve direct interference by one male on the reproductive success of another male, for instance by physically removing another male's sperm prior to mating with a female.Sperm competition is often compared to having tickets in a raffle; a male has a better chance of winning (i.e. fathering offspring) the more tickets he has (i.e. the more sperm he inseminates a female with). However, sperm are not free to produce, and as such males are predicted to produce sperm of a size and number that will maximize their success in sperm competition. By making many spermatozoa, males can buy more ""raffle tickets"", and it is thought that selection for numerous sperm has contributed to the evolution of anisogamy with very small sperm (because of the energy trade-off between sperm size and number). Alternatively males may evolve faster sperm to enable their sperm to reach and fertilize the ovum first. Dozens of adaptations have been documented in males that help them succeed in sperm competition.