Answer:
In humans, genetic variations are caused because humans reproduce by a sexual life cycle which is termed as meiosis. In such a life cycle, the offspring receives half the chromosomes from the mother and half from the father. Crossing over and random assortment of chromosomes are two phenomenons which occur during meiosis. Due to these two phenomenons, genetic variations are caused.
During crossing over, the exchange of DNA segments between the homologous chromosomes takes place which brings about the genetic variations.
Answer:
if pure FF and pure ff marry, phenotypic ratio is all Ff or half-half
mild-ruffled feathers for all the chicks
Explanation:
makes sense
Answer: The Americas
Explanation:
Scientists use DNA to track the migration of humans across the planet. After a group migrates away from their ancestral homeland, any mutations that occur are not mixed with those left in the ancestral population. Therefore, DNA samples taken from __the Americas__ would have the most unique mutations, representing the most recent population to migrate to a new area.
The answer to the question:
<span>This is an image of a kelp forest. All BUT ONE is a characteristic of kelp and kelp forests on the west coast of North America. That is:
A) Kelp are large brown algae.
B) Kelp live in cool, relatively shallow waters close to the shore.
C) Kelp forests form in deep, open waters and are found at depths greater than 130 feet.
D) Aquatic organisms use the thick blades in a kelp forest as a shelter for their young from predators in the area.
is:
</span>C) Kelp forests form in deep, open waters and are found at depths greater than 130 feet.
