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Reika [66]
3 years ago
9

How does the amount of uranium in zircon tell us how old the crystal is?

Biology
1 answer:
Aleks04 [339]3 years ago
5 0
Uranium- lead which is the oldest & one of the most <span>refined of the </span>radiometric dating<span> schemes</span>
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Scientific investigations often lead to the formulation of new scientific questions. charle’s darwin reviewed his observations a
Veronika [31]

Can evolution create new species over time through natural selection?

is the question he would be prompted to ask based on his voyage.

<h3>Who was Charles Darwin ?</h3>
  • English scientist Charles Darwin gained notoriety for his theory of natural selection, which postulated that organisms in an ecosystem adapt and evolve in order to maintain their survival.
  • Because of this, Darwin was inspired to consider whether natural selection can eventually result in the emergence of new species after studying the selective breeding of pigeons.
  • Darwin came to the following conclusion based on these straightforward observations:
  • In a population, some individuals would have hereditary qualities that assist them survive and reproduce (given the conditions of the environment, such as the predators and food sources present).

Learn more about Darwin theory here:

brainly.com/question/21616794

#SPJ4

3 0
2 years ago
Read 2 more answers
You perform the following dihybrid cross: A blaBx Ab/aB. The A and B genes control different traits. What phenotypic ratio would
Luda [366]

Answer:

Option-D

Explanation:

In the given question the genotype of parental allele is- AbaB X AbaB. The alleles formed will be- AB, Ab,aB, ab in which the crossover allele will be AB and ab.

1. Unlinked genes

Now of these alleles are unlinked then the alleles will assort independently of each other therefore performing the punnett square we will get dihybrid ratio as 9:3:3:1 in which  

1. A_B_ are 9

2. aaB_ are 3

3. A_bb are-3

4. aabb- 1

Since the crossover allele are AB and ab therefore A_B_ are 9 and aabb- 1 represent recombinant genotype.

2. Linked genes

When the genes will be linked then chances of crossing over will be reduced as a result of which only two type of allele will be formed which are-  Ab and aB and the recombinant frequency will become less.

Crossing these allele will  form Aabb , AaBb , AaBb  and aaBB  genotypes. The recombinant ratio will decrease as A_B_ is 2 and aabb is not present.

Thus, option-4 which states that the unlinked ration is  9:3:3:1  and linked ratio is  <9: >3: >3: <1 is correct.

7 0
3 years ago
Which is NOT true about binary stars?
VladimirAG [237]

Answer:

They are always of equil brightness.

Explanation:

8 0
2 years ago
Why is the best definition of directional selection
Anna35 [415]

Answer: Directional selection occurs when individuals with traits on one side of the mean in their population survive better or reproduce more than those on the other. ... Directional selection does the “heavy lifting” of evolution by tending to move the trait mean toward the optimum for the environment.

7 0
3 years ago
Read 2 more answers
When colorblind women married a male with normal vision, all their daughters have normal vision and all their sons are colorblin
worty [1.4K]

Answer:

X-linked recessive

Explanation:

The trait is a sex-linked trait because the daughters are not colorblind, but the sons are. We know this its recessive because the daughters have inherited the mother's X chromosome that has the colourblindness trait, but are not colorblind because the father's X does not have the colourblindness trait. The sons are colourblind because they inherited the X from their mother with the colourblindnese trait and a Y from their father. The colourblindness trait or normal vision trait is not carried on the Y, so the mother's X chromosome's trait is expressed.

Sorry if it's confusing i tried my best to explain it

8 0
2 years ago
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