An organism’s phenotype results from two basic factors: the expression of an organism’s genetic code, or its genotype, and the influence of environmental factors. Both factors may interact, further affecting phenotype.
What factors can affect phenotype?
Environment Can Impact Phenotype
Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal’s genes are expressed, which ultimately affects the animal’s phenotype.
How is phenotype controlled?
Mendel’s studies in pea plants implied that the sum of an individual’s phenotype was controlled by genes (or as he called them, unit factors), such that every characteristic was distinctly and completely controlled by a single gene.
What are 2 factors that can affect traits?
Various factors, including genetic makeup, exposure to harmful substances, other environmental influences, and age, can affect expressivity. Both penetrance and expressivity can vary: People with the gene may or may not have the trait and, in people with the trait, how the trait is expressed can vary.
What are the two factors that determine phenotype mark both answers?
Two factors that determine the phenotype of a trait are a combination of genetic makeup and the environment’s effect on that makeup.
What two things influence an individual’s phenotype quizlet?
Genetic and environmental factors combine to influence phenotype.
Which two mechanisms regulate the expression of the genes in the lac operon?
The lac operon of E. coli contains genes involved in lactose metabolism. It’s expressed only when lactose is present and glucose is absent. Two regulators turn the operon “on” and “off” in response to lactose and glucose levels: the lac repressor and catabolite activator protein (CAP).
What are the 3 types of phenotypes?
With one locus and additive effects we have three phenotypic classes: AA, Aa and aa.
When there are 2 dominant alleles for the same gene?
If two alleles of a given gene are identical, the organism is called a homozygote and is said to be homozygous with respect to that gene; if instead the two alleles are different, the organism is a heterozygote and is heterozygous.
What are two environmental factors that are likely to affect gene expression?
In addition to drugs and chemicals, temperature and light are external environmental factors that may influence gene expression in certain organisms.
What are the factors that control traits?
ch 5 multigame
|Factors that control traits are called||genes.|
|Scientists call an organism that has two different alleles for a trait a||hybrid.|
|What does the notation AA mean to geneticists?||two dominant alleles|
|What does the notation Aa mean to geneticists?||one dominant allele and one recessive allele|
How are traits controlled?
Traits are determined by genes, and also they are determined by the interaction with the environment with genes. And remember that genes are the messages in our DNA that define individual characteristics. So the trait is the manifestation of the product of a gene that is coded for by the DNA.
Is PP genotype or phenotype?
Predicting Offspring Phenotypes
Only offspring with the pp genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.
What is having two different genes for a trait?
The combination of alleles that an organism carries constitutes its genotype. If the paired alleles are the same, the organism’s genotype is said to be homozygous for that trait; if they are different, the organism’s genotype is heterozygous.
Which statement best contrasts genotype and phenotype?
Terms in this set (7) Which statement best contrasts genotype and phenotype? Genotype describes an animal’s genetic traits, while phenotype describes an animal’s observable traits.