KBio fghuujugj Bio 3.2
UNDERSTANDING
HOW THE ENVIRONMENT, AND/OR THE INTERACTION OF ALLELES, AFFECTS THE EXPRESSION
OF GENETIC TRAITS
Bio 3.2
UNDERSTANDING HOW THE ENVIRONMENT, AND/OR THE INTERACTION OF ALLELES, AFFECTS THE EXPRESSION
OF GENETIC TRAITS
By: Kacey Caudill
There are many aspects that contribute to the environment affecting gene expression it can be anything from harmful chemicals in an environment to the light in the area. Externally, the environment can affect your phenotype, or physical appearance. Internally, it could mess with your metabolism or hormones. One major internal environmental influence that affects gene expression is gender, as is the case with sex-influenced and sex-limited traits. Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, thereby influencing the way an organism develops and functions.
Meiosis plays a major role in both sexual reproduction and Genetic variation, Meiosis helps with the division of the chromosomes in the life cycle after fertilization occurs. This is essential so the chromosome number can be compensated. Meiosis also plays a large role in Genetic Variation, this allows independent assortment and crossing-over to happen.
Offspring ratios can be determined through a large variety of inheritance patterns. It can be from having a dominant trait (this is the trait that is expressed.) This can be vice-versa with a recessive trait (a trait that is not expressed.) It could be caused by a co-dominant trait (this is where there are two dominant alleles in a gene expression that are both being fully expressed.) A heterozygous condition in which both alleles at a gene locus are partially expressed, often producing an intermediate phenotype. Ratios can be determined by of a set of three or more alleles, or alternative states of a gene, only two of which can be present, this is called multiple alleles. Lastly, this an be represented by sex-linked traits, this is a trait associated with a gene that is carried only by the male or female parent.