![]() The tympanic membrane separates the outer ear from the middle ear. Sound frequency is a concept that characterizes the pitch of a sound, defining it as low, medium or high. Sound is a type of mechanical energy, the result of the transmission of energy from vibrating air particles from a sound source to more distant parts. In animals, it occurs from the outside in (centripetal) and in vegetables from the inside to outside (centrifuge). Telophase: The chromosomes begin to spiral out The nucleoli and the nuclear membrane begin to appear, And the centrioles are already located in pairs in each daughter cell.Ĭytokinesis: It is the breakdown of the cell in two. Metaphase: The chromosomes are very visible as they reach the maximum of spiraling The chromosomes attach to the spindle fibers in the equatorial region of the cell next to each other Īnaphase: The spindle fibers begin to shorten, and as a result, each filament is pulled to the cell poles. The core absorbs water, swells, and clutters the nuclear membrane. Prophase: At this stage, the chromosomes begin to become visible due to spiraling The nucleoli begin to disappear The centrioles begin to spindle fibers that will help in cell division. Interphase: The chromatin filaments duplicate There are two types of division, mitosis (equational = each parent cell produces two daughter cells genetically identical) and meiosis (reductive = each mother cell produces four daughter cells with half the number of chromosomes). Its chromosomic charge is 23.Īnswer: two diploid cells two diploid cells Here you have 46 pairs of chromosomes about to create two cells with 46 chromosomes each (2n).Īnaphase of meiosis II: all singles chromatids (n) are in the poles and the plasmatic membrane begins to close to obtain two haploids (23 chromosomes each) cells.Įgg cell is the result of meiosis II and is the breeding cell. Metaphase of meiosis I: homologs chromatids are in the equatorial plane to be pulled apart after replication. Here you have 46 chromosomes about to create two cells with 23 (n) chromosomes. Metaphase of meiosis II: Sister chromatids are in the equatorial plane to be pulled apart without being replicated. At the end of meiosis II, you have all haploid (n) cells, with half of the genetic charge. ![]() At the end of meiosis I, you still have diploids cells (2n) this means, you have a pair of chromosomes in each cell. Meiosis is a process in which gametes create. Smith is A0, 50% of children will be group A, and 50% will be group 0.īaby Jane is group A, she could be either Smith or Jones, but baby Sara is group 0 the only chance is that her family was the Smith. Smith is AA, 100% of children will be A, and if Mr. Smith is group 0 this means, she has two recessive alleles. Smith is group A this means, he has either two A alleles or A0. When you draw the Punnett square, you'll find that chances are 50% group A, and 50% group B. Jones is 0 this means, she has two recessive alleles. Jones is AB this means, he has co-dominant alleles. The brain interprets the impulses as sound (music, voice, a car horn, etc.).To know which baby belongs to who you need to draw both families Punnett squares. These impulses are delivered to the brain via the hearing nerve. Inside one of the tubes, tiny hair cells pick up the vibrations and convert them into nerve impulses. The cochlea contains tubes filled with fluid. The vibrations are passed to the three small bones of the middle ear, which transmit them to the cochlea. These funnel through the ear opening, down the external ear canal, and strike your eardrum, causing it to vibrate. The inner ear contains the cochlea which changes sound into neurological signals and the auditory (hearing) nerve, which takes sound to the brain.Īny source of sound sends vibrations or sound waves into the air. These three bones, or ossicles, are called the malleus, the incus and the stapes (also referred to as the hammer, the anvil and the stirrup respectively). The middle ear contains three small bones which help amplify and transfer sound to the inner ear. The eardrum (tympanic membrane) separates the ear canal from the middle ear. The outer ear (the part you can see) opens into the ear canal. The ear has three main parts: the outer ear (including the external auditory canal), middle ear and inner ear.
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