Chapter 3: Reproduction of Organisms
... Because males produce sperm and females produce eggs, one of the disadvantages of sexual reproduction is getting egg and sperm together for fertilization. Some species, such as the sea urchin shown in Figure 4, produce millions of egg cells or sperm cells and release them into water. This increases ...
... Because males produce sperm and females produce eggs, one of the disadvantages of sexual reproduction is getting egg and sperm together for fertilization. Some species, such as the sea urchin shown in Figure 4, produce millions of egg cells or sperm cells and release them into water. This increases ...
the quantitative genetics and coevolution of male and female
... more readily than sperm length. Genetic correlations between traits within a sex could also constrain evolution. For example, in the cockroach Nauphoeta cinerea, sperm number was genetically negatively associated with testes mass (Moore et al. 2004), a result that would not have been predicted a pri ...
... more readily than sperm length. Genetic correlations between traits within a sex could also constrain evolution. For example, in the cockroach Nauphoeta cinerea, sperm number was genetically negatively associated with testes mass (Moore et al. 2004), a result that would not have been predicted a pri ...
Angiosperm Reproduction
... • Coevolution is the evolution of interacting species in response to changes in each other • Many flowering plants have coevolved with specific pollinators • The shapes and sizes of flowers often correspond to the pollen transporting parts of their animal pollinators – For example, Darwin correctly ...
... • Coevolution is the evolution of interacting species in response to changes in each other • Many flowering plants have coevolved with specific pollinators • The shapes and sizes of flowers often correspond to the pollen transporting parts of their animal pollinators – For example, Darwin correctly ...
Why do sperm carry RNA? Relatedness, conflict
... relatedness. Clearly, this need not be only MHCs (which are vertebrate specific), but merely needs to involve factors that are variable across males, and we note that approximately half of the sperm RNAs appear to be variable across sperm samples [37]. Even if RNAs are not directly detectable extern ...
... relatedness. Clearly, this need not be only MHCs (which are vertebrate specific), but merely needs to involve factors that are variable across males, and we note that approximately half of the sperm RNAs appear to be variable across sperm samples [37]. Even if RNAs are not directly detectable extern ...
Lesson 3 | Plant Reproduction
... Some seeds have outer coats that are hard, abrasive, or heavily barbed with hooks on the end of sharp spines. These seeds readily snag onto a passing animal’s fur or person’s clothing. Animals often become irritated when there are too many burrs stuck to them. When you see deer rubbing against trees ...
... Some seeds have outer coats that are hard, abrasive, or heavily barbed with hooks on the end of sharp spines. These seeds readily snag onto a passing animal’s fur or person’s clothing. Animals often become irritated when there are too many burrs stuck to them. When you see deer rubbing against trees ...
Chapter 38 Plant Reproduction
... zygote. The other sperm combines with the two polar nuclei of the embryo sac’s large central cell, forming a triploid cell that develops into the nutritive tissue called endosperm. ...
... zygote. The other sperm combines with the two polar nuclei of the embryo sac’s large central cell, forming a triploid cell that develops into the nutritive tissue called endosperm. ...
video slide
... zygote. The other sperm combines with the two polar nuclei of the embryo sac’s large central cell, forming a triploid cell that develops into the nutritive tissue called endosperm. ...
... zygote. The other sperm combines with the two polar nuclei of the embryo sac’s large central cell, forming a triploid cell that develops into the nutritive tissue called endosperm. ...
Sexual Health - Cystic Fibrosis Ireland
... inheritance. CF is a disease that is inherited in an autosomal recessive pattern. Everybody inherits two copies of the CF gene, cystic fibrosis transmembrane regulator (CFTR). Those with cystic fibrosis inherit two altered copies of the CF gene. A CF carrier is someone who inherits only one defectiv ...
... inheritance. CF is a disease that is inherited in an autosomal recessive pattern. Everybody inherits two copies of the CF gene, cystic fibrosis transmembrane regulator (CFTR). Those with cystic fibrosis inherit two altered copies of the CF gene. A CF carrier is someone who inherits only one defectiv ...
Effect of cooling and freezing, the two first steps
... insemination; the percentage of does kidding was 67%, with 6.5 rabbits/female kidding, but no females were inseminated with fresh sperm for comparison. Maurer et al. [9], used the same extender as Stranzinger et al. [18], and they compared the results for sperm which had been stored for 5 h at 37 ºC ...
... insemination; the percentage of does kidding was 67%, with 6.5 rabbits/female kidding, but no females were inseminated with fresh sperm for comparison. Maurer et al. [9], used the same extender as Stranzinger et al. [18], and they compared the results for sperm which had been stored for 5 h at 37 ºC ...
REPRODUCTION Reproduction is a process of production of new
... secretes a hormene, FSH ( follicle stimulating hormone). It stimulates the ovaries to develop an egg and to release certain hormones. The various hormones released during the menstrual cycle and the changes taking place in the uterus and the ovary at the same time are briefly explained below. The FS ...
... secretes a hormene, FSH ( follicle stimulating hormone). It stimulates the ovaries to develop an egg and to release certain hormones. The various hormones released during the menstrual cycle and the changes taking place in the uterus and the ovary at the same time are briefly explained below. The FS ...
VI. Human and Ecological Relevance of Bryophytes
... 2. Male gametangium called the antheridium (club shaped) 3. Gametangia produced at tips of leafy gametophytes 4. Sperm are flagellated and reach archegonium by swimming in a film of water 5. Sporophyte develops in base of archegonium and grows into a foot, seta, and a capsule 6. Calyptra sits on top ...
... 2. Male gametangium called the antheridium (club shaped) 3. Gametangia produced at tips of leafy gametophytes 4. Sperm are flagellated and reach archegonium by swimming in a film of water 5. Sporophyte develops in base of archegonium and grows into a foot, seta, and a capsule 6. Calyptra sits on top ...
Plant land colonization PPT
... 1. Alternation of Generations and Multicellular, Dependent Embryos • Plants alternate between two multicellular stages, a reproductive cycle called alternation of generations • The gametophyte is haploid and produces haploid gametes by mitosis • Fusion of the gametes gives rise to the diploid sporo ...
... 1. Alternation of Generations and Multicellular, Dependent Embryos • Plants alternate between two multicellular stages, a reproductive cycle called alternation of generations • The gametophyte is haploid and produces haploid gametes by mitosis • Fusion of the gametes gives rise to the diploid sporo ...
Cells The Basic Unit of Life
... In binary fission, the parent cell divides equally into two daughter cells. In budding the parent cell divides unequally. The daughter cell is smaller than the parent cell. But after budding is complete, the daughter cell may grow to the size of the parent. Organisms of the kingdom Fungi, such as th ...
... In binary fission, the parent cell divides equally into two daughter cells. In budding the parent cell divides unequally. The daughter cell is smaller than the parent cell. But after budding is complete, the daughter cell may grow to the size of the parent. Organisms of the kingdom Fungi, such as th ...
Sexual Selection - Evolutionary Biology
... (e.g., a nuptial gift, a good territory or sufficient sperm) • these benefits may either be measured directly or based on a trait correlated with them • usually do not lead to extreme traits ...
... (e.g., a nuptial gift, a good territory or sufficient sperm) • these benefits may either be measured directly or based on a trait correlated with them • usually do not lead to extreme traits ...
topic #11: gymnosperms
... generally and in bryophytes, liquid water is required for gamete transfer. In the ferns and their allies, the sperm are flagellated, but archegonia and antheridia are at or below ground level and generally very close together. Some gymnosperms retain sperm motility, but swimming is internal. Angiosp ...
... generally and in bryophytes, liquid water is required for gamete transfer. In the ferns and their allies, the sperm are flagellated, but archegonia and antheridia are at or below ground level and generally very close together. Some gymnosperms retain sperm motility, but swimming is internal. Angiosp ...
66 LAB 06 - UW Canvas
... (1) As a megasporangium begins to develop, other tissues at its base begin to grow upward and eventually entirely surround it except for an opening, the micropyle, at its distal end. There may be a single such coat or integument around the megasporangium or two. Gymnosperms usually have one integume ...
... (1) As a megasporangium begins to develop, other tissues at its base begin to grow upward and eventually entirely surround it except for an opening, the micropyle, at its distal end. There may be a single such coat or integument around the megasporangium or two. Gymnosperms usually have one integume ...
Life: The Science of Biology, 8e
... paraphyletic group of green algae —all retain egg within parent’s body Green plants: streptophytes plus all other green algae. All have chlorophyll b This textbook: “plants” refers only to land plants What we think of in Kingdom Plantae ...
... paraphyletic group of green algae —all retain egg within parent’s body Green plants: streptophytes plus all other green algae. All have chlorophyll b This textbook: “plants” refers only to land plants What we think of in Kingdom Plantae ...
Avoiding bad genes: oxidatively damaged DNA in germ
... may use antioxidant-dependent sexual signals to assess variation in the efficiency of mates in preventing oxidative damage to sperm DNA. Postcopulatory choice Sexual selection may not only act through behaviours leading to differential copulation with the preferred mate, but also across postcopulato ...
... may use antioxidant-dependent sexual signals to assess variation in the efficiency of mates in preventing oxidative damage to sperm DNA. Postcopulatory choice Sexual selection may not only act through behaviours leading to differential copulation with the preferred mate, but also across postcopulato ...
38-angiosperms text
... to a block in growth of a pollen tube Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings ...
... to a block in growth of a pollen tube Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings ...
The Plants
... Alternation of generations Form phragmoplast and cell plate during cell division Starch is the primary food reserves in the chloroplast Cellulose is the principal component of the cell wall ...
... Alternation of generations Form phragmoplast and cell plate during cell division Starch is the primary food reserves in the chloroplast Cellulose is the principal component of the cell wall ...
Test 1 - WordPress.com
... b. gametophyte 19. In pines, the male gametophyte a. takes a few hours to fertilize the egg of the female gametophyte b. takes a few minutes to fertilize the egg of the female gametophyte c. takes several months to fertilize the egg of the female gametophyte 20. The archegonium of pine forms a. with ...
... b. gametophyte 19. In pines, the male gametophyte a. takes a few hours to fertilize the egg of the female gametophyte b. takes a few minutes to fertilize the egg of the female gametophyte c. takes several months to fertilize the egg of the female gametophyte 20. The archegonium of pine forms a. with ...
Gametophyte
... (3) About 360 million years ago gymnosperms evolved with seeds that consisted of an embryo packaged along with a store of food within a protective covering but not enclosed in any specialized chambers. Today, conifers, consisting mainly of cone-bearing trees such as pines, are the most diverse and ...
... (3) About 360 million years ago gymnosperms evolved with seeds that consisted of an embryo packaged along with a store of food within a protective covering but not enclosed in any specialized chambers. Today, conifers, consisting mainly of cone-bearing trees such as pines, are the most diverse and ...
In-vitro Fertilisation and Related Treatments
... Funding for intra-uterine insemination (including donor insemination for same sex couples and single women): Intra-uterine insemination: will NOT BE funded for patients with unexplained infertility, mild endometriosis or mild male factor infertility. Eligible patients with these conditions should be ...
... Funding for intra-uterine insemination (including donor insemination for same sex couples and single women): Intra-uterine insemination: will NOT BE funded for patients with unexplained infertility, mild endometriosis or mild male factor infertility. Eligible patients with these conditions should be ...
Diploid (2n)
... Vascular tissues in shoots and roots transport water, minerals, and sugars; provide support. Roots anchor plant; mycorrhizae (rootfungus associations) help absorb water and minerals from the soil. ...
... Vascular tissues in shoots and roots transport water, minerals, and sugars; provide support. Roots anchor plant; mycorrhizae (rootfungus associations) help absorb water and minerals from the soil. ...
Fertilisation
Fertilisation (also known as conception, fecundation and syngamy) is the fusion of gametes to initiate the development of a new individual organism. In animals, the process involves the fusion of an ovum with a sperm, which first creates a zygote and then leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside (external fertilisation). The cycle of fertilisation and development of new individuals is called sexual reproduction.