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sukhopar [10]
3 years ago
5

Several species of fish in the genus Astyanax occur only in the waters in completely dark underground caves. These blind cave fi

sh have no external eyes, but have very tiny and functionless eyes under the skin. Genetic studies clearly indicate that the blind cave fish are evolved from surface-dwelling species with typical and functional eyes. The eyes of these blind cave fish are, therefore, an example of ________
Biology
2 answers:
Sunny_sXe [5.5K]3 years ago
7 0

Answer:

a vestigial structure

Explanation:

Vestigial structures are a rudimentary (or even functionless) version of a body part, but they have important functions in a closely correlated or evolutionarily close species, an example of which is the presence of eyes in fish of the genus Astyanax. The existence of these vestigial structures is strong evidence that evolution occurs in organisms, since this structure, today without much apparent function, may in the past have been extremely important to the ancestors of that species.

OleMash [197]3 years ago
7 0

Answer:

A vestigial structure

Explanation:

Several species of fish in the genus Astyanax occur only in the waters in completely dark underground caves. These blind cave fish have no external eyes, but have very tiny and functionless eyes under the skin. Genetic studies clearly indicate that the blind cave fish are evolved from surface-dwelling species with typical and functional eyes. The eyes of these blind cave fish are, therefore, an example of a vestigial structure.

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assume that Q is the frequency of the recessive gene R expressing y color piece and that in a isolated area 68 plants with red a
Oksi-84 [34.3K]

Explanation:

<u>q= 0.566</u>

Homozygous individuals have two copies of the same allele for a gene. Homozygous dominant individuals carry two copies of the dominant allele, while homozygous recessive individuals carry two copies of the recessive allele.

Further Explanation:

DNA sets contain genes that may have different forms named alleles. DNA, which is the genotype, is transcribed into mRNA and later translated into amino acids which are connected together by rRNA to form proteins which constitute the phenotype of an organism. DNA sequence mutations form new allles, impacting the resulting mRNA, and thus the encoded protein. Within species, there may be adaptation, along with genetic drift, preferential breeding, and natural selection.

Within a population certain alleles are fixed over time. In Hardy-Weinberg-allelic frequencies, the equilibrium for a particular gene is not undergoing evolution, being stable for several generations. Mutations, during this time affect the corresponding mRNA, and thus the encoded protein. Evolution may occur within populations, along with genetic drift, selective mating, and natural selection.

Over time, certain alleles become fixed within a population. Equilibrium for a specific gene is not undergoing evolution in Hardy-Weinberg-allelic frequencies are stable for several generations. During this period, mutations do not occur within the population, this is shown as

p^{2} + 2pq +q^{2} = 1   ....(eqn i)

where...

p represents the dominant allele frequency

q represents the frequency of the recessive allele

q^2 = the genotypic frequency of the homozygous recessive

p^2= the genotypic frequency of the homozygous dominant

2pq= frequency of the heterozygous genotype

and simply p+q= 1                  ...(eqn ii)

The allelic freq. of r is denoted by q and the allelic frequency, R is denoted by p...

The total number of individuals= 32+ 68= 100

Thus q= √q^{2}= homozygous recessive individuals  (white flowers)

Since there are 32 white flowering plants , freq rr= 32÷ 100= 0.32

...thus q^{2}=0.32

   and q= √ q^{2}= √0.32= 0.566

Learn more about mutations at brainly.com/question/4602376

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

#LearnWithBrainly  

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Answer:

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Explanation:

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