![]() ![]() How can you tell if she is homozygous (AA) or heterozygous (Aa)? First, if you know what her parents where you can use this information to make an educated guess. The genes that we will focus on in this particular tutorial deal with coat color, coat type, ear type, and body markings. However, genes also affect health, growth, coat type, coat color, ear shape, to name a few. The gene will influence the amount of pigment produced, leading to a diluted or full strength coat color. An example might be, a protein-enzyme that produces the pigment that colors the fur. The genes are converted into messages, called proteins. Remember, if the rat carries even one copy of the dominant gene, for example aa Dd, then the rat will be black. So, if there are two copies of Russian blue as in the case of aa dd then, the rat will be or look Russian blue. However, in the absence of a dominant gene, like in the case where there are two copies of the recessive gene then, it will not be masked. It is said to be hidden, in the sense that it is being masked (not activated). If the offspring carries a recessive gene, then this trait will not be expressed or seen. If a gene you received from your parent happens to be dominant, then it is said to be expressed and observed in the offspring. The chromosomes are always stored in the nucleus of a cell.Ī gene is therefore, a portion of your DNA. It takes the shape of a spiral ladder. DNA coils up into a chromosome, to save space. This DNA molecule is complex and very long. Almost every cell in our body, has DNA, stored in the nucleus. Lastly, learning about coat color inheritance will make possible the preservation of a particular coloration and facilitate not only the development of something new, but also the ability to reproduce it! This page attempts to provide an explanation of genes, coat color genotypes, inheritance, and coat type inheritance.īefore I begin explaining the patterns of inheritance, let's have a quick chat about what DNA is and where it comes from. Anyone working with rats can benefit from a general understanding of the study of inheritance for the appreciation of the many wonderful varieties that rats come in! Furthermore, an understanding of genetics will allow breeders to improve the health and longevity of their herd. Genetics is a fascinating subject that deals with how traits are passed on from generation togeneration. ![]()
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