Answer: C. Homologous chromosomes are separated in meiosis but not in mitosis.
Explanation: There are two main types of division that take place in eukaryotic cells, mitosis, and meiosis. Mitosis is the type of division that is used for growth, repair, and replacement of tissues. Therefore it is not necessary that the cells have different chromosome numbers or are varied genetically in the daughter cells in the case of mitosis.
Meiosis is the division that takes place to form the gametes for sexual reproduction. It is important in the first stages of meiosis I, to introduce variation and to halve the chromosome number.
Chromosomes numbers are halved (from 46 to 23) during meiosis I because the gametes (sperm and egg) come together and fuse during fertilization to form a zygote. When this fusion occurs (23 from the zygote and 23 from the egg), the chromosome number needs to be returned to that of the parent cell (46).
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Genetic variation is introduced during synapsis which only occurs in meiosis, not mitosis. Homologs exchange genetic information during crossing over of synapsis. Entire chromosomes also separate during meiosis I.
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At the end of meiosis, four genetically unique cells are produced with half the number of chromosomes as the parent cell (23 cromosomes) . After the process of mitosis is completed, two cells genetically identical to each pther are produced and have the same number of chromosomes as the parent cell (46 cromosomes).
Genetic variation is actually important because of changing environmental conditions.
Out of the following given choices
a) Brooke’s finger accidentally grazes the hot
iron; she immediately yanks her hand away.
<span>
b) After a satisfying evening meal, Callum
relaxes in front of the television.
<span>
<span>c) Walking toward her car is a deserted parking
garage one night, Danica is surprised by a strange man appearing from nowhere.</span>
<span>
<span>d) Emmeline feels queasy as she approaches the
front of the class to give a speech; suddenly, her throat goes dry.</span>
<span>
The answer is B. The
parasympathetic nervous system is part of the autonomic nervous system that
regulates the unconscious actions of the body. The system is regarded as significant in the ‘rest-and-digest’
activity and also the ‘breed-and-feed’. </span></span></span></span>
Answer:
The mass of a proton in scientific notation, is 1.67×10-27kg.
Explanation:
Answer and explanation;
-All lipids contain carbon, hydrogen, and oxygen. Some of them also contain nitrogen and phosphorus. The four main classes of lipids are fats, waxes, sterols, and phospholipids. Fats are triglycerides.
-The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes.
-Lipids are water-insoluble (hydrophobic), and this property is put to great use in the organisation of cells and tissues.
For example; phospholipids are a class of lipids that is amphipathic; that is it contains fatty acid tails that are hydrophobic, and a phosphate head that is hydrophilic. This means the phosphate group will orientate itself towards water and away from the rest of the molecule, and also gives rise to the special properties that allow phospholipids to be used to form membranes.
Answer:
1) bay - 0%
cream - 0%
buckskin - 100%
2) cream - 25%
bay - 25%
buckskin - 50%
3) co-dominance
Explanation:
Ok so a run down on Punnett Squares, all you have to do is put the parent's genes on the top and right hand side and combine those two genes in the middle as I did in the picture. Now, co-dominance, this basically means that there is no dominant allele. For example, imagine a white flower (W) and a red flower (R). If these two plants were to breed, you would get a pink flower (WR). This means the red allele and the white allele are both co-dominant. It is basically a combination of both genes that result in a mixed phenotype of the two genes, aka red and white makes pink. This is also how you get an AB blood type.
I hope this helps!
