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Linkage mapping is a technique used to determine the relative positions of genes on a chromosome.
Introduction to sex linkage, sex determination, and X-inactivation in genetics.
There are often many different alleles of a gene in a population. In these cases, an organism's genotype, or set of alleles, still determines its phenotype, or observable features. However, a variety of alleles may interact with one another in different ways to specify phenotype.
X-linked inheritance. Genetic linkage & mapping. Pedigree for determining probability of exhibiting sex linked recessive trait. Pedigrees review. Extranuclear inheritance 1. Inheritance of mitochondrial and chloroplast DNA. Non-Mendelian genetics. Science > AP®︎/College Biology > Heredity >
Using fruit flies as a model organism, Morgan discovered a mutant white-eyed male fly and traced its inheritance pattern, revealing a connection between the X sex chromosome and the gene for eye color.
Genes are sections of DNA that code for specific proteins or functional RNA. Alleles, on the other hand, are different versions of the same gene. They can lead to variations in traits like eye color.
Learn about the basics of heredity and genetics with a worked example of Punnett squares in this educational video from Khan Academy.
Lesson 2: Mendelian genetics. Introduction to heredity. Fertilization terminology: gametes, zygotes, haploid, diploid. Alleles and genes. Worked example: Punnett squares. Mendel and his peas. The law of segregation. The law of independent assortment. Probabilities in genetics.
Course: AP®︎/College Biology > Unit 5. Lesson 1: Meiosis and genetic diversity. Fertilization terminology: gametes, zygotes, haploid, diploid. Chromosomal crossover in meiosis I.
Hemophilia, an X-linked recessive trait, affects blood clotting. A carrier woman and a hemophiliac man have a 50% chance of having a daughter with hemophilia. This is determined through a Punnett square, which shows the possible combinations of the parents' alleles.