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nasty-shy [4]
3 years ago
11

Propose an explanation why there might be a sudden appearance of a species in the fossil record.

Biology
2 answers:
nekit [7.7K]3 years ago
8 0

Answer: Option (A)

Explanation: According to the geological time scale, new species comes into existence suddenly and are quite fully developed. The gradual evolution of species from one kind to another is hardly seen and a very few of them were able to record in its history.

     For example, in most of the ammonoides, various step-by-step changes have been showcased but only the size and surface texture are observed to be changed.

  Thus, the correct answer is option (A).

stellarik [79]3 years ago
4 0
D) Fossils could not be found in that layer of rock.
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Explanation:

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An animal that does not have the traits to adapt to its surroundings will?
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<h2>It may become endangered </h2>

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7 0
3 years ago
In fruit flies, curved wings (w) are recessive to the dominant straight wings (W), and ebony body (b) is recessive to the domina
lara [203]

Answer:

The correct answer =

parents : WwBb x wwbb

offspring :

WwBb, Wwbb, wwBb, and wwbb

Explanation:

It is given that the straight wings (W) is dominant over curved wings (w) and the ebony body (b) is recessive to the dominant gray body (B) and there is a cross between curved wings and ebony body and straight wings and gray body is made. The phenotypic ratio is: 1:1:1:1 for the four different phenotypes straight gray, straight ebony, curved gray, curved ebony.

It is not given the genotype of parents, however, for the curved and ebony fly, it is clear that both alleles are recessive as recessive alleles only appear in absence of the dominant allele of the trait.

For another parent, the possible genotypes can be  WWBB or WwBb, however in the case of WWBB the phenotypic ratio would not be equal therefore,

crossing WwBb x wwbb

This can be represented in the form of a punnett square as below:

          wb   wb           wb           wb  

WB WwBb WwBb WwBb WwBb Straight wing, Gray body

Wb Wwbb Wwbb Wwbb Wwbb Straight wing, Ebony body

wB wwBb wwBb wwBb wwBb Curved wing, Gray body

wb wwbb wwbb wwbb wwbb Curved wing, Ebony Body

The phenotypic ratio is: 1:1:1:1 for the four different phenotypes

4 0
2 years ago
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