In this introductory video, we have a look at the most important terms relating to the topics inheritance.
This video gives an overview of the different types of crosses, such as autosomal dominant, recessive, sex-linkage and co-dominance.
Monohybrid crosses are also known as single-factor crosses.
Here a condition is passed on on a non-sex chromosome. The condition is expressed, if two recessive alleles are present.
Here a condition is passed on on a non-sex chromosome. The condition is expressed, even if only one allele is present (heterozygous).
The inheritance of blood groups (ABO system) is an example of a co-domnant inheritance and multiple alleles.
A test cross takes place when an organism with an unknwn genotype (Rr or RR) is crossed with an organism of a known genotype (rr). Based on the offspring, the genotype of the parents can be deduced.
Here an allele is present on a sex chromosome, usually the X-chromosome.
A pedigree is a graphical representation of a family tree. It is possible to deduce the genotype of individuals based on the pedigree diagram.