Lesson 3 Essay Questions: 1. Compare and contrast directional selection and disruptive selection and provide an example of each. Both directional and disruptive selection is a type of natural selection. Natural selection is the differential survival and/or reproduction of organisms as a function of their physical attributes. (phenotype) This results in evolution over many generations. Each mode of selection alters the mean or variance of a phenotypic trait in a population or species. These
Words: 1451 - Pages: 6
Grasshoppers sexually reproduce when the male grasshopper introduces his spermatozoa through his aedeagus (reproductive organ) into the females ovipositor. The sperm sack contains a large packet of proteins known as spermatophylax that helps keep the eggs properly nourished (New World Encyclopedia, 2008). Once fertilized the female lays the eggs with her ovipositor and stomach one to two inches underground to keep them protected during the winter months until they hatch in warmer weather (New World Encyclopedia)
Words: 412 - Pages: 2
It became generally accepted that sperm were the actual carriers of hereditary factors from males to their offspring. Other biologists studied the ovaries of animals, noted the presence of swollen bodies--which they correctly assumed contained eggs--and hypothesized that these eggs were also units of transmission of hereditary factors. Epigenesis Some biologists of the 17th and 18th centuries believed that they saw miniature individuals in the sperm or eggs of various organisms, an observation
Words: 1922 - Pages: 8
Class Final: The genetics of cancer * Cancer is when mitosis goes wrong! * Cancer cells lack regulated ability to divide only when needed so they divide uncontrollably. * Hyperplasia- Beginning of cancer development; heightened cell division that can create tumor (neoplasm) * Dysplasia- The change in cells/tissue * Cancer cells go from being complex to primitive—which means cancer cells lose their shape, size and ability to function like normal cells * Cancer originates
Words: 1486 - Pages: 6
et al. 2016). During gametophyte stage, C-fern spores produce haploid gametes (sperm and/or egg) via mitosis; male gametophyte produce sperms and hermaphrodite gametophyte produce both sperms and egg (Hurney et al. 2016). Gametophytes germinate earlier are hermaphroditic, which are heart shaped with archegonia and antheridia; males are smaller and thumb shaped, surrounded by antheridia (Hurney et al. 2016). Sperm and egg will fertilize in to a diploid zygote, which is the beginning of sporophyte stage
Words: 683 - Pages: 3
N 4531 Mother and Family OB Lab Assignment “In the Womb” [pic] Assignment: The purpose of this lab is to develop and understanding of fetal growth from an embryo to a fetus. These videos give will provide a basic understanding. 1. Watch "National Geographic: “In the Womb" (90 minutes total.) Available on YouTube, please watch all segments 1-10. https://www.youtube.com/watch?v=s0WM9oRr07w 2. You can also view Alexander Tsarias’ video From Conception to Birth 2010
Words: 1644 - Pages: 7
All of Us Are Sexual Why is sexuality so important? All of us are sexual. Our sexuality includes our body and how our body works our biological sex our gender — our biological, social, and legal status as girls and boys, women and men our gender identity — our feelings about our gender our sexual orientation — straight, gay, or bisexual our values about life, love, and the people in our lives And sexuality influences how we feel about all of these things and how we experience
Words: 2946 - Pages: 12
internal female reproductive organs. a. Ovaries: Each month, the ovary releases 1 egg that contains genetic code b. Fallopian tubes: passageway to the uterus after fertilization 2. Describe what occurs in one of the phases of the ovarian cycle. a. Ovulation: LH spike occurs and the woman is fertile 3. Describe the function of one of the internal male reproductive organs. a. Epididymis transports and stores sperm cells that are produced in the testes 4. Describe what occurs during an erection
Words: 795 - Pages: 4
Common names: Golden snail (English), Golden apple snail (English),Channeled applesnail (English), Apple snail (English), Gelbe Apfelschnecke (German), Golden kuhol (English-Philippines), Miracle snail (English-Philippines). Scientific name: Pomacea canaliculata (Lamarck, 1819) Synonyms: Ampullaria canaliculata Lamarck, 1822 Classification Kingdom: | Animalia | Phylum: | Mollusca | Class: | Gastropoda | (unranked): | clade Caenogastropodainformal group Architaenioglossa | Superfamily:
Words: 11198 - Pages: 45
Surrogacy is when another woman carries and gives birth to a child for another individual. Though it can be an emotionally intense and legally complex arrangement, it is growing in popularity among parents as a way of having children. Having another woman bear a child for a couple to raise, usually with the male half of the couple as the genetic father, is referred to in antiquity. Babylonian law and custom allowed this practice and infertile woman could use the practice to avoid a divorce, which
Words: 2795 - Pages: 12
