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Delicious77 [7]
3 years ago
5

Which of the following groups of species is a monophyletic group, or clade??

Biology
1 answer:
Pachacha [2.7K]3 years ago
6 0
In common cladistic usage, a monophyletic group<span> is a taxon (</span>group<span> of organisms) which forms a clade, meaning that it consists of an ancestral species and all its descendants. The term is synonymous with the uncommon term holophyly.
</span>Examples :<span>  Mammalia, Aves (birds), angiosperms, insects, etc.</span>
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When does the total number of chromosomes get reduced from 46 pairs to 23 individual chromosomes? View Available Hint(s) When do
ivann1987 [24]

Answer:

23 pairs of chromosomes (46 individual chromosomes) are redued to 23 individual chromosomes in meiosis I.

During Meiosis I

Explanation:

Meiosis is a type of cell division that results in four daughter cells with each having half the number of chromosomes as in the parent cell. During meiosis, cell division occurs twice because before the two halves of a duplicated chromosome (sister chromatids) is separated, it still needs to separate homologous pair of chromosomes, which is a similar but non-identical pair of chromosomes received from both parent. Hence, meiosis occurs in a two step division process; Meiosis I and Meiosis II.

Note that, a diploid cell contains 23 pairs of chromosomes ( 46 chromosomes in total). Each pair of chromosome is from the haploid gamete produced by each parent after meiosis.

Before going into meiosis I, the cell must first undergo growth and replicate its DNA in the interphase stage just like in mitosis. In the Prophase I of meiosis I, chromosomes condense as in mitosis but also pair up. Each chromosome aligns with its homologue pair to form a structure called TETRAD or BIVALENT.

Homologous pairs, not individual chromosomes (23 pairs in number) line up at the metaphase plate for separation during metaphase I.

In anaphase I, the homologues are pulled apart by the spindle fibres and move apart to opposite ends of the cell. The sister chromatids of each chromosome, however, remain attached to one another and don't come apart. Hence, the cell now has 23 chromosomes on one side of the cell, and another 23 on the other side.

After cytokinesis (division of the cytoplasm) in meiosis I, two daughter cells are produced and each now possesses 23 individual chromosomes (haploid) different from the parental 23 pairs (diploid).

N.B: Sister chromatids separate in the anaphase of meiosis II, where each chromatid is counted as an individual chromosome.

4 0
3 years ago
Which of the following statements BEST describes photosynthesis?
coldgirl [10]

Answer:

2

Explanation:

photosynthesis takes carbon dioxide from the air, and water from the soil to make oxygen, which is then released back into the air, and the glucose is stored and used as energy within the plant

hope this helps :)

3 0
3 years ago
Proteins that bind to cells and stimulate cell division are called
ANTONII [103]

Answer:

when G1/S cyclin-CDK is activated. Expression of G1/S cyclins is regulated by E2F proteins 

Explanation:

I've found this on Google

Commitment to cell division occurs at Start when G1/S cyclin-CDK is activated. Expression of G1/S cyclins is regulated by E2F proteins in conjunction with pRB proteins.. Mitogens stimulated cell division by increasing the amount of G1 cyclins.

3 0
3 years ago
Read 2 more answers
List three facts about the specific body system for endocrine system
Scrat [10]

Answer:

The endocrine system is a chemical messaging network. Endocrine glands secrete hormones, which are carried by the circulatory system throughout the body. The primary endocrine glands are the pituitary, hypothalamus, pineal gland, thyroid, parathyroid, adrenal, pancreas, ovary, and testis. Hormones maintain homeostasis in the body.

Explanation:

Hope this helps!

7 0
3 years ago
I need desperate help.​
Basile [38]
The answer is b, numerous meaning more in amount
7 0
2 years ago
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