Concept explainers
The diploid number of the hypothetical animal
What amount of DNA is contained in each nucleus at the end of S phase?
Explain why a somatic cell of
Geneticus introductus has the same number of chromosomes and the same amount of DNA at the beginning of mitotic prophase as one of these cells does at the beginning of prophase I of meiosis.Complete the following table by entering the number of chromosomes and amount of DNA present per cell at the end of each stage listed.
Learn your wayIncludes step-by-step video
Chapter 3 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Additional Science Textbook Solutions
Brock Biology of Microorganisms (14th Edition)
Brock Biology of Microorganisms (15th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
Anatomy & Physiology
Campbell Biology (10th Edition)
Human Anatomy & Physiology (2nd Edition)
- Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes) does a cell from this organism have immediately after fertilization?arrow_forwardA normal diploid cell from a chimpanzee has 48 chromosomes. How many chromosomes will be in a chimpanzee cell just before meiosis begins, after meiosis I, and after meiosis II? After which of these stages will the chromosomes have two chromatids?arrow_forwardHuman somatic cells have 46 chromosomes. How many chromosomes are present in human cells undergoing each of the following phases of meiosis? Interphase - Answer: 0 2 3 4 6 9 2 Prophase I - Answer: 0 2 3 4 6 9 2 Prophase II - Answer: 0 2 3 4 6 9 2 Telophase I - Answer: 0 2 3 4 6 9 2 Telophase II - Answer: 0 2 3 4 6 9 2arrow_forward
- At what stage of mitosis can the kind and number of chromosomes be easily detected and determined? How does non disjunction in meiosis lead to numerical chromosomal aberration? If cell division during gametogenesis is non meoitic, what is its consequence to the future generations of diploid organisms? What is the relationship between meiosis and fertilization?arrow_forwardDuring metaphase I of meiosis, tetrads align along the metaphase plate independently of each other. Therefore, there is a random “shuffle” of maternal and paternal chromosomes in the resulting gametes.The following diagram demonstrates how this works in a diploid cell with four chromosomes (2n=4) . Because there are two pairs of chromosomes and each pair can align in one of two ways during metaphase I, the number of possible variations in the gametes produced is 22 or 4.For an organism that is , there are three pairs of chromosomes, so the number of possible variations in the gametes produced due to independent assortment in metaphase I is 23 or 8. In an organism with a haploid number of 7, how many possible combinations of maternal and paternal chromosomes can occur in its gametes? a. 72=49 b. 27=128 c.17=1 d. 214=16 384arrow_forwardDuring metaphase I of meiosis, tetrads align along the metaphase plate independently of each other. Therefore, there is a random “shuffle” of maternal and paternal chromosomes in the resulting gametes.The following diagram demonstrates how this works in a diploid cell with four chromosomes (2n=4) . Because there are two pairs of chromosomes and each pair can align in one of two ways during metaphase I, the number of possible variations in the gametes produced is 22 or 4.For an organism that is , there are three pairs of chromosomes, so the number of possible variations in the gametes produced due to independent assortment in metaphase I is 23 or 8. In an organism with a haploid number of 2n=6 , how many possible combinations of maternal and paternal chromosomes can occur in its gametes? a. 72=49 b. 27=128 c.17=1 d. 214=16 384arrow_forward
- In a Drosophila where somatic cells have 8 chromosomes, and gametes have 4 chromosomes, what is the number of tetrads in a cell during metaphase II?arrow_forwardTruffles (Tuber borchi) have 2n=8 chromosomes. For the mitotic and meiotic stages below, draw the chromosomes and chromatids, and give the number of homologous pairs, chromosomes, and chromatids present. Be sure to differentiate homologous chromosomes by using size, shape, or other labeling mechanism. Metaphase of mitosis ( # homologous pairs # chromosomes # chromatids Anaphase of meiosis II – draw and count chromosomes for only 1 cell ( # homologous pairs # chromosomes # chromatidsarrow_forwardA diploid cell has 4C genetic material and 16 chromosomes at the start of cell division. Identify the: (1) no. of chromosome per cell at S phase (2) no. of pairs of homologous chromosomes per cell at Metaphase 1 (3) no. of chromosomes per cell at Anaphase 1 (4) amount of genetic material per cell after Meiosis 2 (5) amount of genetic material per cell after Meiosis 1arrow_forward
- Somatic cells of chimpanzees contain 48 chromosomes.How many chromatids and chromosomes are present at: (a) anaphase of mitosis, (b) anaphase I ofmeiosis, (c) anaphase II of meiosis, (d) G1 priorto mitosis, (e) G2 prior to mitosis, (f) G1 prior tomeiosis I, and (g) prophase of meiosis I?How many chromatids or chromosomes are presentin: (h) an oogonial cell prior to S phase, (i) a spermatid, (j) a primary oocyte arrested prior to ovulation,(k) a secondary oocyte arrested prior to fertilization,(l) a second polar body, and (m) a chimpanzee sperm?arrow_forwardThe developing egg cell of a plant with a diploid chromosome number 20 was treated with colchicine. A normal sperm cell subsequently fertilized this egg. How many chromosomes would you expect to find in the zygote? Explain.arrow_forwardMitotic nondisjunction can occur, particularly in tumor cells. Assume a single nondisjunction event involving the X chromosome occurs in a cell undergoing mitosis in a human female. First, consider the daughter cell with the smaller number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have? Next, consider the daughter cell with the larger number of chromosomes: How many total chromosomes will this cell have? How many X chromosomes will this cell have?arrow_forward
- Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning