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notka56 [123]
3 years ago
14

Explain whether carbon 14 can be used to find the ages of rocks.

Biology
1 answer:
notka56 [123]3 years ago
8 0

Can carbon dating be used to identify the age of rocks or fossils?

Only organic fossils up to 70,000 years of age. Other isotope dating techniques must be used to find the age of older fossils and rocks.

How do scientist use fossils to to find out the age of rocks?

Usually it is rocks which determine the age of fossils, but if the fossils discovered are already of a known age, the age of the rock can be inferred

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How could the botanist best determine whether the genotype of the green-pod plant is homozygous or heterozygous?
murzikaleks [220]

Answer:

C

Explanation:

Homozygosity is when the two alleles (gene form) are the same while heterozygosity is when the alleles are of different types.

In a gene, an allele is capable of masking the expression of another. The allele being expressed or that masks is called the DOMINANT allele while the allele being masked is the RECESSIVE allele.

A recessive allele will only be expressed (phenotypically) if the two alleles are of the same type i.e. homologous but when a dominant phenotype is expressed, one cannot ascertain whether the organism is heterozygous or homozygous for that gene. e.g T is the gene coding for height in plant, T which represents tallness is dominant over t, representing shortness. In a heterozygous (Tt) and homozygous dominant (TT) state, the plant will be phenotypically tall but will only be short in a homozygous recessive (tt) state.

Since the plant will be tall in homozygous (TT) or heterozygous (Tt), we cannot detect the actual genotype of the plant. Hence, a test cross is done.

A test cross is a cross between a dominant phenotype and a homozygous recessive in order to determine the actual genotype of the dominant organism i.e. whether homozygous or heterozygous.

In this case involving pod color gene, since the botanist is trying to determine whether the genotype of the green pod plant is heterozygous or homozygous, it means the allele for green pod is dominant over that of yellow pod (recessive).

N.B: The recessive trait can only be expressed if it is homozygous. Therefore, the yellow pod plant has homozygous recessive genotype.

A test cross is conducted by the botanist to determine whether the green pod plant is heterozygous or homozygous by crossing it with a yellow pod plant (homozygous recessive).

If any of the offspring plants exhibit recessive traits i.e. yellow pods, it means the parent green pod plant is heterozygous but if all the offspring plants show phenotypic dominant traits i.e green pod, it means the parent green pod plant is homozygous.

8 0
3 years ago
What is the best explanation scientists have been able to come up with for the appearance of Ostrich-like birds in different con
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B is the answer

Explanation:

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Do autotrophs use cellular respiration
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Yes all organisms display cellular respiration.
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What makes proteins
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<span><span>Nucleus-Controls most cell processes and contain the hereditary information of DNA
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8 0
3 years ago
Which choice best describes the parts of the water cycle? The sun's thermal energy causes water on the earth to evaporate. The w
Travka [436]

Answer:

The sun's thermal energy causes water on the earth to evaporate. The water vapor then condenses and forms precipitation. The precipitation then falls back to the surface of the earth.

Explanation:

<u>The water cycle is an illustration of how water continuously moves or circulates between the atmosphere and the various parts of the earth. </u>

<em>Evaporation of water from the surface of the earth by the thermal energy from the sun causes water to leave the surface of the earth into the atmosphere. When the atmospheric water vapor (humidity) at the upper strata of the atmosphere becomes high, the vapor condenses to form clouds which later forms precipitation that falls back to the surface of the earth.</em>

The ocean's tidal energy does not cause water to cycle on earth.

4 0
3 years ago
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