Do all cells express the same genes?
Thanks to gene regulation, each cell type in your body has a different set of active genes – despite the fact that almost all the cells of your body contain the exact same DNA. To do this, liver cells express genes encoding subunits (pieces) of an enzyme called alcohol dehydrogenase.
Do all cells have the same genes explain?
Almost all of the cells in your body share the same DNA as was found in that first cell*. For a cell to work, 1000’s of these proteins must be made, each doing its particular job. Eyes and lungs are so different because different sets of proteins are made in the various eye and lung cells.
Why do cells that contain the same genetic material do not develop into the same types of cells?
Which of the following best explains why cells that contain the same genetic material do not develop into the same type of cells? Because internal and external stimuli can trigger the activation of specific genes in the DNA. Because random mutations can occur in the DNA of cells during early embryonic development.
How are genes expressed differently in different cells?
A cell typically expresses only a fraction of its genes, and the different types of cells in multicellular organisms arise because different sets of genes are expressed. Moreover, cells can change the pattern of genes they express in response to changes in their environment, such as signals from other cells.
Why do cells regulate which genes are expressed and which aren t?
Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell, for example. Gene regulation also allows cells to react quickly to changes in their environments.
How can environmental factors affect the expression of genes?
Internal and external environmental factors, like gender and temperature, influence gene expression. 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.
What are two environmental factors that are likely to affect gene expression?
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 can an environment affect a child development?
An enriching and stimulating home environment fosters healthy growth and brain development by providing a child with love, emotional support, and opportunities for learning and exploration. In families where only one parent is present, there are often fewer economic and emotional resources.
What are the 4 phases of growth?
There are four distinct phases of the growth curve: lag, exponential (log), stationary, and death. The initial phase is the lag phase where bacteria are metabolically active but not dividing.
How do you calculate the number of bacteria in a population?
How to calculate the number of bacteria in a population
- The mean division time for bacteria population A is 20 minutes.
- In order to answer this, you can split the calculations into two sections.
- If the bacteria grow for six hours, each bacterium will divide 3 times per hour × 6 hours = 18 times.