26 as 52/2 =26
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Answer:
I think this is the answer
Explanation:
Image on the Right:
A: Anther
F: Filament
L: Ovary
J: Stigma
K: Style
O: Ovule
Image on the Left:
B: Receptacle
C: Sepal
O: Ovary
L: Ovules
H: Anther
D: Petal
P: Style
The statement which best explains why adequate wastewater treatment is necessary for urban areas is; "Wastewater cannot be purified by nature.".
Urban areas refer to those areas that have a dense population of people and also have quite a number of industries that generate several tons of waste. Disposal of these wastes is often an important environmental concern.
Many of the wastewater produced in urban areas contain chemical substances such as cleaning agents, persistent organic pollutants, heavy metals etc. Nature can not remove these waste materials. They can only be removed by appropriate wastewater treatment.
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Answer:
The possible blood types their children could have are A or 0.
Explanation:
The I gene determines the blood type of a person. I is the dominant allele, while i is the recessive allele.
- IA dominant over i. The person presents A type of antigens.
- IB dominant over i. The person presents B type of antigens.
- IA and IB are codominant. The person presents both types of antigens, A and B.
- i is the recessive allele. The person does not present any antigen.
Cross: a person who is blood type O with a person who is blood type A
Parental) ii x IA-
Gametes) i i IA -
Punnet Square) IA -
i IAi -i
i IAi -i
The - symbol represents the possibility of either IA allele or i allele. This is, the parental with blood type A might have the genotype IAIA or IAi
F1) 2/4 = 1/2 IAi
2/4 = 1/2 -i (-i could be either IAi or ii, depending on the genotype of the parental with blood type A)
- <u>Option 1</u>: ii x IAIA
F1) 100% IAi (The whole progeny will have blood type A)
- <u>Option 2</u>: ii x IAi
F1) 50% IAi (Half of the progeny will have blood type A)
50% ii (Halfa of the progeny will have blood type 0)
The possible blood types their children could have are A or 0.
Answer:
The correct answer is (b): Individuals with certain advantageous traits are selected, in the sense that they produce the most offspring.
Explanation:
Natural selection can cause a change in allele frequencies over time, making the best alleles, those better adapted, more common in the population over generations.
This is called Fitness, and it refers to how many offspring organisms of a particular genotype or phenotype leave in the next generation, relative to others in the group.
Natural selection can act on different alleles of a single gene, or on polygenic traits.
Natural selection can shift phenotype distributions in three ways:
-Stabilizing selection: Intermediate phenotypes are more fit than
extreme ones, e.g. camouflage.
-Directional selection: One extreme phenotype is more fit than all the
others, e.g. are more hidden in shadow and survive better than other
types.
-Disruptive selection: Both extreme phenotypes are more fit than those
in the middle, e.g. mimesis on octopuses.
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