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Nutka1998 [239]
3 years ago
9

The illustration shows homologous structures among a human arm, a seal forelimb, a bird wing, and a bat wing. explain how the st

ructures are evidence of evolution.
Biology
1 answer:
Alex17521 [72]3 years ago
6 0

The structures are evidence of evolution in that all living things are homologous with a genetic code which is extremely similar though other genetic code exists and then it suggests a common ancestor.

Human harm is considered homologous structures together with bird’s wings, cat’s legs. A human being has bones for example ulna, fingers, and wrist bones that features appear similar to ones in other animals. Bat’s whales have similar homologous structures which demonstrate that these creatures have a common ancestor.

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What happens during metaphase I?
saveliy_v [14]

Answer:

the centrioles are at opposite poles of the cell

the pairs of homologous chromosomes become arranged on a plane equidistant from the poles called the metaphase plate

spindle fibers from one pole of the cell attach to one chromosome of each pair and spindle fibers from the opposite poles attach to the homologous chromosomes

7 0
3 years ago
Scientists have observed that pythons have vestigial leg bones. They have also observed that snakes in general have more DNA seq
hichkok12 [17]
The answer is <span>They both suggest that snakes evolved from an ancestor with legs.

The second choice is not correct since we have no information about pythons and other snakes. We only have the relationship between geckos, snakes and legless eels. So, it is said that </span><span>snakes in general have more DNA sequences in common with four-legged geckos than they do with legless eels. This means that snakes are closer to geckos than the legless eels. We cannot conclude from this information which evolved from which, but we can say that </span><span>snakes evolved from an ancestor with legs.
In different case, if the snakes had more DNA sequence in common with legless eels, we would conclude that the snakes evolved from an ancestor without legs.</span>
4 0
4 years ago
Imagine a steep, Rocky Stream. Explain the kinds of adaptations animals living in the stream will have.
Serga [27]

The aquatic organism such as fishes will adapt themselves to have strong fins so as to swim upstream against the current. * The aquatic plants will adapt themselves to grow on the rocks present in the stream. * They may adapt themselves to have a streamlined body that resist being washed downstream by the current.Answer:

Explanation:

4 0
3 years ago
Read 2 more answers
In a diploid species of plant, the genes for plant height and fruit shape are syntenic and separated by 18 m.u. Allele D produce
FinnZ [79.3K]

Answer:

C)Parental: 41% Dr, 41% dR; recombinant: 9% DR, 9% dr.

Explanation:

The notation Dr/dR for genotypes means that one homologous chromosome has the alleles Dr and the other homologous chromosome has the alleles dR.

The heterozygous plant  Dr/dR will produce 4 types of gametes: two identical to the chromosmes the individual has in its somatic cells (called parental), and two gametes which will be a mix of the alleles in the homologous chromosomes (called recombinant).

  • Dr: parental
  • dR: parental
  • DR: recombinant
  • dr: recombinant

To calculate the frequency of each type of gamete, we must use the formula:

Distance (map units) / 100 = frequency of recombination.

18 mu / 100 = 0.18.

The total frequency of recombination between the genes D and R is 0.18, but every time crossing over happens, two recombinant gametes are generated. Therefore, each recombinant gamete will have a frequency of 0.18/2=0.09 = 9%.

The frequency of parental gametes will be:

1 - frequency of recombinant gametes

1 - 0.18 = 0.82

But there are 2 parental gametes, so each of them will have a frequency of 0.82/2=0.41 = 41%.

6 0
3 years ago
QUESTION 3 How might the Inquisition affect social relationships?​
BartSMP [9]

Answer:

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Explanation:

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