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Musya8 [376]
3 years ago
13

Explain how the inheritance patterns of many traits (such as petal color in snapdragons, or skin color in humans) cannot be acco

unted for by Mendelian genetics.
Biology
1 answer:
pantera1 [17]3 years ago
3 0

Answer:

Petal color in snapdragon is an example of incomplete dominance and deviates from Mendel's law of dominance.

Skin color in humans exhibits a continuous variation and is regulated by more than one genetic loci.

Explanation:

Two alleles of a gene do not always exhibit the dominant-recessive inheritance as shown by Mendel. The alleles controlling the petal color in Snapdragon exhibit incomplete dominance since the allele "R" is not able to produce enough pigment in heterozygous condition to completely mask the effect of the recessive allele "r" Therefore, the heterozygous genotype "Rr" gives pink color to petals.

Mendel showed that each genetic trait is regulated by one gene and exhibit discontinuous variations. This is not followed by skin color in humans which is a polygenic trait with multiple genes regulating it. Here, a range of phenotype is present which is regulated by the sum total of the dominant alleles of all the genes involved controlling the melanin production.

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Discussion
Viefleur [7K]

Answer:

The answer to these questions are the following:

1. sucrose solution (higher concentration of water molecules in the onion cells) >> red onion cells will shrink >> smaller diameter

2. distilled water (higher concentration of water molecules in the surrounding solution) >> red onion cells will become turgid >> higher diameter

Osmosis refers to the movement of a solvent (usually water molecules) across semipermeable biological membranes, which occurs from a region of higher concentration to a region of lower concentration. There are three classes of solutions that have different effects on cells due to the process of osmosis:

1. In a hypotonic solution, the cells will become turgid  

2. In an isotonic solution, the cells will become flaccid.  

3. In a hypertonic solution, the cells will shrink (plasmolysis)

When plant cells are placed into a hypertonic solution where there is a greater concentration of solute outside the cells (as in this case sucrose solution), water molecules will move from inside the cells to outside the cells, thereby cells will shrink due to water loss

When plant cells are placed into a hypotonic solution that is diluted in comparison to the content of the cell (as in this case plant cells placed in distilled water) water molecules will move from outside the cells to inside the cells, thereby cells will become turgid.

Learn more about this topic here:

brainly.com/question/11789335?referrer=searchResults

brainly.com/question/11269438?referrer=searchResults

4 0
2 years ago
In a mushroom what is the umbrella shaped portion known as
Romashka-Z-Leto [24]
It's called the fruiting body.
3 0
3 years ago
What year was it a thousand years ago?
Kruka [31]

Answer:

1021

Explanation:

2021 - 1000 = 1021

7 0
3 years ago
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loris [4]
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