Sex cells are gametes (sperm and eggs).
1. They are haploid, which means that they have half the number of chromosomes of somatic (not sex) cells. This way, when they combine with another sex cell (a sperm if it's an egg and vice versa), the zygote will have the correct number of chromosomes.
2. Sex cells are genetically different from their parent cells as well as the other sex cells that are produced by meiosis (which is 3 other sperm in males and usually 2-3 polar bodies in females). The reason for this is that a couple of events (namely crossing-over, independent assortment of chromosomes, and random fertilization) that happen in meiosis create genetic variation. These events do not happen in mitosis (which is the process that occurs for somatic cells).
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation.
Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
These negative impacts can affect human behavior and can prompt mass migrations or battles over clean water.
Answer:
Taxonomy
Explanation:
Taxonomy is basically the study and classification of organisms into families, genus, etc.
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Answer:
Smaller populations have a greater chance of having one allele expressed disproportionately.
Explanation:
Genetic drift corresponds to a drastic casual alteration of the natural order, reaching the genotypic concentration of one or several species, not preliminarily involving natural selection factors, but caused by sudden events. Such phenomenon is characterized by the occurrence of ecological catastrophes, for example: earthquakes, tsunamis, tornadoes, floods, burnings, avalanches and other processes, affecting a large population contingent. Thus limiting the genetic content of a particular group, restricted to the prevailing individuals.
In this situation, with low variability, differentiated individuals will experience a more significant selection pressure in relation to the ascending lineage, which minimized the achievements of selection due to the high number of living individuals. In this scenario, smaller populations will have a greater chance of having a disproportionately expressed allele as the number of members is reduced. We can also see this effect if by using a coin we imagine that heads and tails are two alleles in a population and each coin toss represents one member of that population.
Answer:
D
Explanation:
Because it is formed to fly and most mammals can't fly