Answers
Answer:
More and more of the medium ground finch population would develop the characteristic of having a thick beak for breaking larger seeds. It would be a small amount of them having the characteristic at first, but then gradually the amount would increase until all of them keep this characteristic.
This is an example of natural selection and adaptation. The two words are related, in a way. Natural selection is when a species change over time with a characteristic that helps them adapt better to their environment. The medium ground finch population has to adapt in the change of environment through natural selection of getting the characteristic of thicker beaks for bigger seeds. Developing this characteristic will help more survive and reproduce, allowing the natural selection process to take place easier and quicker.
Explanation:
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Answers
Answer:
.8 miles a minute
Explanation:
convert 2 1/2 hours to minutes and divide it by 120
(change 120 km into meters, making it 120,000 m. change 2 hours and 30 min into sec, making it 9,000 sec. v=d/t so you divide meters by seconds, and get 13.3 m/s)
Answers
Answer:
0.549 is the frequency of the F allele.
0.495 is the frequency of the Ff genotype.
Explanation:
FF or Ff genotypes determine freckles, ff determines lack of freckels.
In this class of 123 students, 98 have freckles (and 123-98= 25 do not).
If the class is in Hardy-Weinberg equilibrium for this trait, then the genotypic frequency of the ff genotype is:
q²= 25/123
q²=0.203
q=
q= 0.451
q is the frequency of the recessive f allele.
Given p the frequency of the dominant F allele, we know that:
p+q=1, therefore p=1-q
p=0.549 is the frequency of the F allele.
The frequency of the Ff genotype is 2pq. Therefore:
2pq=2×0.549×0.451
2pq=0.495 is the frequency of the Ff genotype.
Final answer:
The frequency of the dominant allele, F, in this class is 0.55. The frequency of the heterozygous genotype, Ff, is 0.495. This is calculated using Hardy-Weinberg equilibrium and observed phenotype frequencies.
Explanation:
To start, we need to calculate the frequency of the recessive allele, f, which is easily calculated as those who do not have freckles. From a total of 123 students, 98 have freckles, leaving 25 students with no freckles, which represents individuals who are homozygous for the recessive trait (ff). As these are the only individuals we can be sure of, we take the square root of their frequency to get the frequency of the recessive allele, q. In this case, q = sqrt(25/123) = 0.45. To find the frequency of the dominant allele, p, we subtract q from 1 (because p + q = 1), so p = 1 - q = 0.55.
Next, we'll calculate the frequency of the heterozygous genotype Ff.
Using Hardy-Weinberg equilibrium, we know this is represented by 2pq. Hence, the frequency of genotype Ff would be 2 × 0.55 × 0.45 = 0.495.
This process offers an example of applying the principles of population genetics and Hardy-Weinberg equilibrium to determine the likely genotype frequencies in a given group of individuals based on observed phenotype frequencies.
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Answers
Answer:
The options are
a. A lack of estradiol.
b. Moderate levels of estradiol during an early stage of development.
c. A high level of testosterone during an early stage of development.
d. A high level of testosterone during the late part of puberty.
The answer is b. Moderate levels of estradiol during an early stage of development.
Testosterone is a hormone which is responsible for the secondary sexual characteristics of a male while estradiol is the hormone responsible for the secondary sexual characteristics of a female.
This is why estradiol is the hormone responsible in female development regardless of the chromosomes
a. True
b. False
Answers
The correct answer is B. False
Explanation:
In development, a growth spurt refers to a period of time in which individuals experience rapid growth or development. In the case of an adolescent growth spurt, this is a natural process that occurs to all individuals including boys and girls during puberty. This takes place because during adolescence the hormone levels change and this leads to rapid growth as well as development or maturation of bones, muscle and the sexual or reproductive system. According to this, it is false an adolescent growth spurt occurs only in boys because this is a natural process that occurs on both girls and boys.
Both adolescence males and females have growth spurts
Answers
a. an atomic nucleus is positively charged because it is composed of neutrons
b. an atomic nucleus is positively charged because it is composed of protons
c. An atomic nucleus is negatively charged because it is composed of electrons
d. an atomic nucleus is negatively charged because it is composed of neutrons
Answers
The correct answer is: an atomic nucleus is positively charged because it is composed of protons, option (b) is correct.
The atomic nucleus is the central part of an atom and is composed of protons and neutrons. Protons have a positive charge, while neutrons are neutral (have no charge). Therefore, the presence of positively charged protons in the nucleus is responsible for its overall positive charge.
Electrons, on the other hand, are found in the electron cloud outside the nucleus and contribute to the overall charge neutrality of the atom since they have a negative charge equal in magnitude to the positive charge of the protons, option (b) is correct.
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Answer:
an atomic nucleus is positively charged
Explanation:
because it is composed of protons so A