Answer:
Duplication of the Dax1 is associated to equivocal sex determination on how XY mice develop ovaries and a female phenotype which comes from strong expression of the homologous gene (Ahch) in the first stages of gonadal (and adrenal) differentiation.
Explanation:
Dose-Sensitive Sex Reversal Locus on Chromosome X, Gene 1
, DAX1∗ (officially, nuclear receptor subfamily 0, group B, member 1; NR0B1) is a member of the nuclear hormone receptor superfamily of transcription factors that functions primarily as a transcriptional repressor.
Duplication of the DAX1/NROB1 locus is associated with male-to-female sex reversal, that is ambiguous external genital differentiation ranges.
One X chromosome and one Y chromosome in each diploid cell of their bodies differencite males from females, who typically have two X chromosomes but XX males that are SRY-positive have two X chromosomes, with one of them containing genetic material from the Y chromosome, making them phenotypically male but genetically female.
DAX1 protein may be directly or indirectly involved in gonadal regulation of hypothalamic-pituitary function.
Given: The population density of frogs in a portion of a pond is 12 frogs per square meter. The size of the entire pond is 370 square meters.
To find: The total population size of the frogs in the pond.
Method: Using unitary method of proportions
Solution:
Let p be the density of the frogs present per square meter.
Let A denote the total area of the pond.
∴ p = 12 frogs/m² and A = 370 m²
The total number of frogs in the pond is given by,
Therefore, there are 4440 frogs in the pond.
Water has a high specific capacity of heat, so it absorbs the heat on earth w/o a significant rise of temp. in the water. This helps to buffer the temp. on Earth makes it a relatively constant temperature, which is essential for most organisms.
Introduction of burmese pythons to a local ecosystem can have grave consequences, as has been proven in Florida. Burmese pythons are skilled predators, and they are not easily killed by other animals. If introduced to a climate they can thrive in, they will start hunting local animals. With little to no predators capable of killing them, they will flourish because of plentiful food supply, and they will continue to increase in number. They will decrease the level of animals directly below them in the food chain, which will then increase the number of animals and plants that had previously been eaten by the python's new food.
Basically, don't mess with food chains! :)
Answer:
Physical Change:
- Boiling water
- Breaking a pencil
- Water evaporating
- Denting a car door in an accident
- Tearing paper
- Ice melting
- dissolving
Chemical Change:
- Something rusting
- photosynthesis
- metabolism/digestion
- Nuclear power [atoms are arranged differently]
- Smashing paper with two metal balls, burns paper
- Electricity in water, breaks H2O into H2 and O2
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physical change is when there is only physical change occurring--and it can typically be undone easily,
whereas chemical change is when there is chemical change--which changes the chemical properties of something, which cannot be undone simply.
hope this helps!!
