Arrange the following in the proper sequence in which they occur during a single PCR cycle.

Biology

1 answer:

Slav-nsk [51]4 years ago

7 0

Answer:

The correct order is 3 - 2 - 1

Explanation:

In order for DNA replication to occur, both strands need to be separated so the polymerase can start adding nucleotides. In a PCR, this is achieved by an increase in temperature. After both strands are separated, a DNA primer binds the sequence from which the replication will start. This is because DNA polymerases need a short complementary sequence to attach to before they start replicating. Once both strands are separated and primers are paired to DNA, Taq Polymerase can start adding nucleotides to complete the cycle.

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How is the genotype of the offspring different from that of the homozygous dominant parent?

tatuchka [14]

Since it's been crossed with a homozygous wrinkled green, the offspring has a genotype for heterozygous round and yellow. As round and yellow are dominant traits, they're expressed in the phenotype. But when self pollinated in the f2 generation, the recessive ones will show as well

Hope it helps :')

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3 years ago

If glucose is absent, but so is lactose, the lac operon will be ________.

umka2103 [35]

Answer:

Activated

Explanation:

In the presence of lactose, and in the absence of glucose, lactose will bind to a protein called a "repressor," deactivating it. Through this, RNA polymerase has a free way to synthesize the mRNA that will give enzymes for lactose degradation.

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3 years ago

Read 2 more answers

Please help! c:

patriot [66]

I think I understand even without the picture. I'll add a picture of the Punnett Square filled in, but what you're crossing is

Tt x tt (heterozygous crossed with a homozygous recessive)

The ratio you get in the end is 2 heterozygous (Tt) and 2 homozygous (tt) offspring, so the ratio is 1:1.

So the percentage of offspring that are homozygous recessive is 50%.

8 0

3 years ago

Read each description below regarding the the cns control of the ans. then click and drag each into the appropriate category bas

Aloiza [94]

Cerebral cortex
1. Emotion can invoke an autonomic response.
2. Sexual thoughts or image which can increase blood flow to the genitals.

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1. It activates the flight or fight response.
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3. It is the integrating center for thermoregulation.

Brainstem.
1. It is integrating centers for reflexes which control heart rate and blood pressure.
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4 years ago

A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. if he marries a woman who is also

kakasveta [241]

F- allele for freckles
f- allele without freckles

1) The man is heterozygote and has freckles, its indicating that the allele for freckles is dominant.
A cross between him and a woman who is also heterozygote: Ff x Ff
it would result in the following probabilities:
- 1/4 - homozygote with freckles: FF
- 2/4 - heterozygote with freckles: Ff
- 1/4- homozygote without freckles:ff

Their son would have a probability of 75% of being born with freckles.

2) The cross resulted in this probabilities:
- 1/4 - homozygote with freckles: FF
- 2/4 - heterozygote with freckles: Ff
- 1/4- homozygote without freckles:ff
So, the chance of being born heterozygote for this gene is 2/4, which is the same as half (50%).

6 0

4 years ago