Relationship between mendels law of independent assortment and meiosis

IB Biology Notes - Meiosis

relationship between mendels law of independent assortment and meiosis

Meiosis 1 is responsible for genetic variation because it is the process that Mendel developed his Law of Independent Assortment after. The principle of independent assortment describes how different genes independently Mendel was performing dihybrid crosses, which are crosses between Meiosis is a type of cell division that reduces the number of chromosomes in a very close to one another on the same chromosome because of genetic linkage. Describe the behavior of the chromosomes in the phases of meiosis: Explain the relationship between Mendel's Law of Independent Assortment and Meiosis.

relationship between mendels law of independent assortment and meiosis

In this article, we'll take a closer look at the law of independent assortment and how it is used to make predictions. We'll also see when and why the law of independent assortment does or doesn't! If you are not yet familiar with how individual genes are inherited, you may want to check out the article on the law of segregation or the introduction to heredity video before you dive into this article.

Meiosis | BioNinja

What is the law of independent assortment? Mendel's law of independent assortment states that the alleles of two or more different genes get sorted into gametes independently of one another. In other words, the allele a gamete receives for one gene does not influence the allele received for another gene.

relationship between mendels law of independent assortment and meiosis

Pea color and pea shape genes Let's look at a concrete example of the law of independent assortment. Imagine that we cross two pure-breeding pea plants: Because each parent is homozygous, the law of segregation tells us that the gametes made by the wrinkled, green plant all are ry, and the gametes made by the round, yellow plant are all RY. The allele specifying yellow seed color is dominant to the allele specifying green seed color, and the allele specifying round shape is dominant to the allele specifying wrinkled shape, as shown by the capital and lower-case letters.

Then crossing over occurs, in which genetic information in the form of DNA is exchanged between the homologous chromosomes of the tetrad. The site where crossing over occurs is called a chiasmata, and it is an x-shaped structure.

relationship between mendels law of independent assortment and meiosis

Explain how meiosis results in an effectively infinite genetic variety of gametes through crossing over in prophase I and random orientation in metaphase I. If a homologous pair is denoted as having chromoses A and B paired together, random orientation during Metaphase I means that in any one cell after Meiosis I, the cell could have either chromosome A or B, creating a random orientation of chromosomes in haploid cells that leads to genetic variability. Added to this is the effect of crossing over during Prophase I, meaning that chromosomes could have any combination of chromosomes A or B, creating an almost infinite genetic variability.

Define recombination The process by which progeny derive a combination of genes different from that of either parent is known as recombination. State Mendel's law of independent assortment Mendel's Law of Independent Assortment states that "Allele pairs separate independently of each other during the formation of gametes.

relationship between mendels law of independent assortment and meiosis

Meiosis is the process whereby gametes are produced. Dihybrid crosses[ edit ] Calculate and predict the genotypic and phenotypic ratios of offspring of dihybrid crosses involving unlinked autosomal genes.

In a test cross between diyhibrid, unlinked autosomal genes AaBb and AaBb: In a test cross between AaBb and aabb: Autosomal Gene Linkage[ edit ] State the difference between autosomes and sex chromosomes.

The law of independent assortment

Sex chromosomes determine the gender of the organism, while autosomes do not. Explain how crossing over in prophase I between non-sister chromatids of a homologous pair can result in an exchange of alleles. Crossing over involves homologous chromosomes exchange "slices" of their own DNA with the non-sister chromatids of a homologous pair.

Thus, this results in an exchange of alleles as the alleles from one chromatid are being exchanged with the alleles on a non-sister chromatid. Define linkage group A group of gene loci known to be linked; a chromosome. There are as many linkage groups as there are homologous pairs of chromosomes.

relationship between mendels law of independent assortment and meiosis

Explain an example of a cross between two linked genes. When crossing two linked genes such as an organism with the genes AABB with another organism with the genes aabb, the resulting F1 generation offspring can only have the genes AaBb. Furthermore, the F2 generation offspring will have the genes in a 9: Identify which of the offspring in such dihybrid crosses are the recombinants. The offspring that have traits different from the parents are recombinants.