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3 years ago

What causes convection currents in earth

Biology

2 answers:

Kamila [148]3 years ago

6 0

Answer:

Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks.

Yuliya22 [10]3 years ago

4 0

Convection currents are the result of differential heating. ... It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth. In the atmosphere, as air warms it rises, allowing cooler air to flow in underneath.

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Can someone help me with this 1-6

Elena L [17]

Answer:

1. sperm cell

2.testicles

3.egg

4.ovary

5.fertilization

6.fertilized egg = foetus

Explanation:

6 0

3 years ago

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

IgorC [24]

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7 0

3 years ago

Two phenotypically normal parents have a child with CF. i. What are the genotypes of each parent? ii. What is the probability th

katen-ka-za [31]

To first dive into your question, here are some vocabulary terms that I will be using and will be helpful to you as well.

Homozygous dominant (BB): Is not affected by cystic fibrosis.
Homozygous recessive (bb): Is affected by cystic fibrosis.
Heterozygous (Bb): A carrier for cystic fibrosis.
Phenotype (Ex: Having cystic fibrosis): The appearance of an allele pair.
Genotype (Ex: bb): The genetic makeup of an allele pair.

We know that if both of the parents are phenotypically normal, there is no way that they can be homozygous recessive (bb), or have cystic fibrosis. We also know that since they have a child with this disease, they can't be homozygous dominant (BB) either. This means that both parents have to be carriers (Bb) in order for them to have a child with cystic fibrosis.

Below I have attached a Punnett square with both of the heterozygous parents.

Each child they have will have a 1/4 or 25% chance of having cystic fibrosis.

5 0

2 years ago

Which type of reproduction results in offspring that are genetically different from the parents sexual or asexual

MariettaO [177]

The answer is a sexual reproduction. This is due to the formation of gametes that enable the variation of the offspring of the parents. Firstly, each gamete contributes half the genetic material (alleles)from either parent. The dominant alleles will show in the phenotype of the c=ofspirng. Additionally, during meiosis (the process that makes gametes), recombination of genetic material can occur hence transferring unique combination of genes from that of the parent. Therefore, there are many possible combinations of gametes that gives the offspring variance from the parents

8 0

2 years ago

Describe the 4 combinations of active or inactive regulatory proteins that could be present at any time in the cell

Sergeeva-Olga [200]

The bacterial genes are usually found in operons. Each operon comprises regulatory sequences of DNA that function as binding sites for regulatory proteins, which inhibit or encourage transcription. The regulatory proteins usually combine with small molecules that can make the protein inactive or active by altering its tendency to combine with DNA.

The four combinations of active or inactive regulatory proteins, which could be observed at any time in the cell are:

1. Active repressor, active activator,

2. Active repressor, inactive activator

3. Inactive repressor, active activator

4. Inactive repressor, inactive activator

8 0

3 years ago