Briefly describe, in your own words, how the single cell formed at fertilization differentiates into different types of cells. How is the mitotic phase different from meiosis? Explain why all of the cells of your body that have 23 pairs of chromosomes are identical in their genetic make-up. ...
Plum gametes have 24 chromosomes. How many chromosomes would a zygote have? a) 12 b) 24 c) 36 d) 48 If a cell has 20 centromeres, how many chromosomes does it have? If humans have 46 chromosomes in each of their body cells, how many chromosomes would you expect to find in an ...
Plus, it talks about gametes creating an embryo. Are gametes like sperm and eggs? Isn't that what forms an embryo? Bytitans62— On Jun 28, 2011 @Emilski - Obviously I'm not an expert since I'm brushing up with this article, but I believe cell differentiation begins with stem cells....
Germ celltumors(GCTs) are a neoplasm, or an abnormal growth of cells resulting in a mass of tissue, that are derived from the germ cells, the precursors of the gametes or sex cells, namely eggs andsperm. GCTs most often arise in theovariesor testes, known collectively as the gonads, ...
Haploid cells:Gametes, egg and sperm(contain a single set of chromosomes). What is Type A and Type B spermatogonia? There are three subtypes of spermatogonia in humans:Type A (dark) cells, with dark nuclei. These cells are reserve spermatogonial stem cells which do not usually undergo active...
Germline mutations occur in gametes. Somatic mutations occur in other body cells. Chromosomal alterations are mutations that change chromosome structure. Point mutations change a single nucleotide. Frameshift mutations are additions or deletions of nucleotides that cause a shift in the reading frame. ...
Diploidcells, symbolized by 2n, possess two sets of chromosomes. Somatic (body) cells are diploid. Chromosomes contain two gene alleles (copies) for inheritable traits. Two haploid gametes result in a diploidzygote. You'll also read aboutpolyploidcells, which are other ploidys such as triploid ...
L. 2005. Stem cells are units of natural selection in a colonial ascidian. Cell 123: 1351.Laird DJ, De Tomaso AW, Weissman IL. Erratum: Stem cells are units of natural selection in a colonial ascidian. Cell . 2006; 124 (3):647–648....
Phenotypic analysis revealed that SSSs OX resulted in shortening of the plant, inflorescence, and fruit, and thus the body architecture of these organs was notably modified (Figure S3). Interestingly, the styles of OX lines were sharply shortened, subsequently, the stigma rapidly atrophied and ...
In which cells are the male sex hormones produced? What are those hormones? How is their production regulated? What is the male reproductive hormone? What is a hormone? What do hormones do for the cells and tissues of the body? What cell type secretes androgens (testosterone) in the tes...