Define each of the following terms: Conception- when chromosomes of the biological mother and father combine to form a single cell –the fertilized egg or zygote. pg 355 Zygote- the single cell formed at contraception from the union of the egg cell and the sperm cell pg 352 Germinal
Sexual Development and Differentiation The sperm and ova also known as the gametes which is another term for sperm and ova. The gametes each contain twenty-three single chromosomes. When the sperm and ova come together during fertilization this is when the chromosomes become paired. When it comes to male and females there are genetic differences. If the fertilized egg receives both XX chromosomes then the egg will become female.
Every individual has 23 pairs of chromosomes. One pair of chromosomes (the 23rd) is the sex chromosomes, because they determine an individual’s sex. The male pair of chromosomes is XY and the female pair is XX. If an embryo inherits an X chromosome from both parents it will become a girl and if it inherits an X from the mother and a Y from the father, it will become a boy. There is a link between an individual’s chromosome sex (XX and XY) and their external genitalia (vagina or penis) and internal genitalia (ovaries or testes).
January 11, 2014 Pgs: 250-257 AP Biology Meiosis and Sexual reproduction 1. Differentiate between haploid and diploid cells. Give one example of each cell. The difference between a haploid and a diploid cell is that a diploid is a cell that has two sets of chromosomes. On the other hand, a haploid cell contains only one set of chromosomes.
Assignment: Gender Identity Colleen Rabe Course: PSY 265 Due Date is week 3 day 7 There several factors that are used when determining gender identity. These include genetic factors, environmental situations, psychosocial factors, and even sexual hormones. “Gender identity is almost always consistent with chromosomal sex.” From the moment sperm fertilized an ovum, our destiny to be a girl or a boy is chosen. Usually at this chromosomes from the male donor and from the female come together and combine to make a “zygote”. Starting about six weeks into the pregnancy, our bodies began to form and create the sex of what they are meant to be.
2. Where does fertilization take place? Fertilization takes place where the sperm meet up with the egg in one of the fallopian tubes. 3. At what stage of fetal development does implantation take place?
Know the cell cycle regulation. Know what telomeres are What is cancer and tumor Know what apoptosis is Chapter 9 What is reproduction What is the difference between asexual and sexual reproduction What are the advantages and disadvantages of asexual and sexual reproduction What is meiosis Know the different stages of meiosis What is fertilization What are germ cells Know what is crossing-over is Know what is polyploidy and nondisjuction is. Chapter 10 Know what a gene and allele are Know who is Mendel and what he did Know Mendel’s Laws Know the difference between a punnett square, test cross, and a dihybrid cross. Know how incomplete dominance, codominance, pleiotropy, polygenetic traits, epistasis, and the environment can affect phenotype. Chapter 40 What is a community?
2. The ovarian cycle is events that happen before and after the egg matures. The uterine cycle is when the uterus prepares the lining of the uterus to receive an embryo in case of fertilization. The uterine and ovarian cycles prepares the endocrine tissues and releases eggs while the uterine cycle prepares and maintains the uterine lining. Follicles prepare the egg for ovulation and as the follicles grow estrogen is released and a low level of progesterone.
What make up the DNA of the human body. Page 1 Kieran O’Connor Unit 4 However only about half of all fertilised eggs will develop into babies and many of the eggs will be lost. Pregnancy Pregnancy is divided into three phases, or trimesters, in the first phase is conception until about twelve weeks, Pregnancy begins when the egg is penetrated by a sperm, after the fertilisation the egg cell will start to divide. Then after two or three days the cells will make new cells to make the fertilised egg the size of a pin head. Then the cells will travel into the lining of the uterus 2 Page where it becomes anchored.
Genetics 1. Gametes have half the numbers of ___________ that body cells have. (chromosomes) 2. What are the 2 cell divisions that meiosis, diploid cells undergo? (meiosis I and II) 3. Who led the groundwork for genetics?