Sex linkage. ... In mammals, the female is homogametic, with two X chromosomes (XX), while the male is the heterogametic sex, with one X and one Y chromosome (XY). Genes on the X or Y chromosome are called sex-linked.
Answer: b
Explanation: I took the test
Answer:
The different sentences that belong to different groups are given as follows:
Bacteria
A common genus is Pelagibacter.
Some types found in the photic zone carry out aerobic photosynthesis.
They are the predominant prokaryotes above 1000m
Archaea
Below 1000m the most common phylum is Thaumarchaeota.
Most of these living below 1000m are thought to be ammonia oxidizers.
They increase to near 50% of total prokaryotes below 1000m
Viruses
Most are inactivated by hydrolytic enzymes or sunlight
Turnover in sea water is relatively rapid, the populations are replaced within a few days or weeks
They are the most numerous biological entities in seawater
Answer:
The correct answer is "secondary succession, an ecological succession step where an area previously occupied by living beings is disrupted".
Explanation:
In ecological succession, an ecosystem changes and develops through a series of steps. The first step, is the primary successional stage where rocks or other sedimentary structures are colonized by microorganisms. The second step, where the ecosystems changes towards a relatively-stable mature stage, occurs when an area previously occupied by living beings is disrupted. This step is named secondary succession, and the most clear example of this phenomena occurs when wildfire clears oak and hickory forests.
