Part III: Cell division, sexual reproduction and genetic variability Background:
ID: 11218 • Letter: P
Question
Part III: Cell division, sexual reproduction and genetic variability
Background: Eukaryotic cells can divide by mitosis or meiosis. In humans, mitosis produces new cells for growth and repair; meiosis produces sex cells (gametes) called sperm and eggs.
Although mutations are the ultimate source of genetic variability, both meiosis and sexual reproduction also can contribute to new genetic combinations in offspring.
Assignment Essay Question: How do both meiosis and sexual reproduction (fertilization) produce offspring that differ genetically from the parents? Be sure to talk about the two specific steps in meiosis that increase variability as well as the process of fertilization.
You will submit your Graphic Organizer with all answers in your Submit Assignment area.
Provide references in APA format. This includes a reference list and in-text citations for references used throughout the assignment. Note that there is a Reference page for listing sources included on the Graphic Organizer.
You will submit your Graphic Organizer with all answers.
Explanation / Answer
meiosis occurs during gametogenesis and ogenesis meiosis occurs in diploid cells and leads to haploid cells or gametes. meiosis is divided into MI and MI stages. during MI stage of meiosis ,crossing over between homologous chromosomes and non homologous chromosomes. crossing over between chromatids of homologous chromosomes and non homologous chromosomes leads to genetic variability, because the order of genes on chromosome vary due crossing over and recombination. sexual reproduction genetic variability,occurs due pre zygotic division and post zygotic cell division s genetic variability in the offsprings. in human , there are 30,000 genes are present in genome. because of permutation and combination of genes during the cell division meiosis leads genetic variability,