Answer: Species A is diploid, it means 2n=36, the haploid number is 36/2=18. Species B is triploid, it means 3n=36, then the haploid number is 36/3=12.
Explanation:
A chromosome is an ordered bundle of DNA associated with proteins such as histones, and it is found in the nucleus of the cell. Different organisms have different numbers of chromosomes. Humans, for example, have 23 pairs of chromosomes, 22 of them are autosomal pairs, and one pair are sex chromosomes, which indicates the sex of a person. Each parent contributes one chromosome from his or her autosomal pair and one from the sex pair, so that the offspring get half of their chromosomes from their mother and half from their father.
<u>A haploid cell has only one set of chromosomes (n), whereas diploid cells have two sets of chromosomes (2n) and triploid cells have three sets (3n). In the example of humans, a diploid cell is a somatic cell and has 46 chromosomes (or 23 pairs). And a haploid cell, a gamete for example, has 23 chromosomes. </u>
If two species of plants carry 36 chromosomes, and species A is diploid, it means 2n=36. Then the haploid number is 36/2=18. Species B is triploid, it means 3n=36. Then the haploid number is 36/3=12.
Answer:
<u>Oxbow lake is formed when a bend in a river is cut off to form a lake.</u>
Explanation:
- <u>OPTON A - It is formed as lakes grow larger due to erosion and begins to look like an ox. </u>
This statement is incorrect , as the shape of the oxbow lake is not like an ox , it is a <u>horse-shoe shaped lake .</u>
- <u>OPTION B - It is formed when a bend in a river is cut off to form a lake.</u>
This statement is correct , as An oxbow lake is a U-shaped lake that forms to create a free-standing body of water when a large meander of a river is cut off.
- <u>OPTION C - It is formed when a delta grows large enough to cut off a river to form a lake. </u>
This statement is also wrong, as a<u> river delta</u> is specified by this statement.
- <u>OPTION D - It is formed when a dam stops the flow of a river and creates a lake.</u>
This statement is also false, since the creation of a<u> reservoir</u> is established by this statement.
<u>FORMATION OF OXBOW LAKE -</u>:The neck of the meander gets narrower and narrower progressively. The curve gradually grows so close that the river slices through the neck of the meander to take a new, straighter path. Sediment locks the end of the old loop over time. This leaves a region of water that is different, called an oxbow lake.
Hence , <u>the correct option is B.</u>
Answer:
d
Explanation:
provides animals with homes letting them breed
Answer:
True
Explanation:
A plane mirror always forms a virtual image (behind the mirror). The image and object are the same distance from a flat mirror, the image size is the same as the object size, and the image is upright.