examples of GM crops in the United State. Give examples of characteristics being engineered into crops.

During one year eight turtles are born into q population

blagie [28]

The death rate of turtles during the year is option A, i.e., 7.

<h3>What is death rate?</h3>

The mortality rate, also known as the death rate, is a measure of the number of deaths (in general or due to a specific cause) in a given population, scaled to the population's size, per unit of time.

The complete question is:

During one year, eight turtles are born into a population. Ten turtles immigrate into the population, but two emigrate to find mates. If the overall population growth is nine turtles, what was the death rate of turtles during the year? Use this formula: population growth = (birth rate + immigration) – (death rate + emigration)

Given,

Birth rate = 8 turtles / year

Immigration = 10 turtles / year

Emigration = 2 turtles

Population growth = 9 turtles.

Let that the death rate for the given population is X.

One know that,

population growth = (birth rate + immigration) – (death rate + emigration)

9 = (8 + 10) - (X + 2)

9= 18 -( X+ 2)

X= 7

Thus, he death rate of turtles during the year is option A, i.e., 7.

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5 0

2 years ago

C) This mutation is a recessive trait. What is the likelihood that a woman who does not possess the sickle cell trait and a man

maks197457 [2]

What is Sickle cell anemia?

Sickle cell is an autosomal recessive trait of humans that arises through mutation in normal gene. The gene for this trait is found in recessive form and you need two copies of the gene - one from father and one from mother- to have the trait expressed. If the trait is expressed it causes a disease called sickle cell anemia.

People with the sickle cell anemia disease have red blood cells of crescent or sickle shape. The red blood cells of this shape can cause many complications in body. They get stuck in blood vessels and cause pain. They also die quickly and make a person anemic (pale).

Probability to have a child with sickle cell anemia:

If a mother is normal but a father is carrier for the trait, then the situation will be as:

Here N indicate normal allele, S indicate allele for sickle cell anemia.

Mother ˣ Father

NN NS

Gametes: N N N S

Offspring: NN NS NN NS

50% : Normal

50% : Carrier

0% : Sickle cell anemia

It means that 50 % kids will be normal and 50% will be carrier for the trait and none of the offspring will have disease Sickle cell anemia. However, those who are carriers can carry the disease to the next offspring if they are married to a carrier or a person with sickle cell anemia.

6 0

3 years ago

What happens in step 1 one of replication?

vazorg [7]

DNA Replication begins at the Origin of Replication

4 0

3 years ago

Based on this gel electrophoresis, answer the following 2 questions. Which rat could be a nonidentical sibling or parent of Rat

Georgia [21]

Q1)
In this we are asked to find either a sibling or a parent of rat A. the genetic composition of rat A should be somewhat equal to the sibling or parent but the DNA of rat A isn't identical to the others. DNA strands' nucleotide composition of organisms are characteristic to the organism.
Some of the mutations that happen such as duplication of sequence fragments and other types of mutations during gamete formation brings about diversity in the offspring. whilst some of the DNA sequences are the same as that of the parents, some other mutations bring about changes in the DNA content.
Once the DNA fragments are cut with restriction enzymes, some of the fragments obtained are same for parent and offspring and some are different. Rat D maybe a parent or sibling as some of their fragments have the same nucleotide composition, hence same molecular weight but some other fragments have different compositions.

Q2)
Rat C is an identical twin of rat A. identical twins are exceptional cases where the nucleotide compositions are the same. Identical twins come from the same fertilised egg therefore DNA sequences and mutations that happened during gamete formation is the same.
In the gel given, both these rats have DNA fragments of the same length and same nucleotide composition, hence their mobility in the gel is the same, which is why they're found at the same distance from the wells.
In this both rats have bands at the same levels, hence DNA is identical.

Q3)
crossing over during homologous recombination is to bring about genetic diversity (C).
During meiosis, in gamete formation, crossing over is where DNA fragments are exchanged between homologous chromosomes. This makes the daughter cells formed not identical to the parent cell nor the other daughter cells. Due to this phenomenon, gametes formed have different compositions to that of parent cells and other gametes.
Due to this, genetic diversity is brought about as offspring are genetically different to the parents and siblings.

Q4)
Dad 3
the child will gain his DNA from both mother and father. genotype of the child is from genes from both parents. During gel electrophoresis, we can analyse the bands obtained in the childs lane, and try to match it with the mother and father. Bands should either match mothers DNA or fathers DNA.
When we look at the bands on childs DNA, if there are bands corresponding to that level in the mothers DNA, then it has been inherited from the mother. If there are no bands of that length in the mothers DNA, it should be from the fathers, then we have to look at the possible fathers DNA and find which father has a DNA band of that length.
Since there are a lot of bands, we can match with both mothers and fathers DNA to find the father correctly.
In this case Dad 3 and mothers DNA bands together make up the childs DNA band pattern, hence he is the father.

6 0

4 years ago

What signals a cell to start dividing

Alex787 [66]

Its DNA, i.e. nucleus is in charge of it. If the cell works inside of a multicellular organism, it will only divide if more cells are necessary. (If growth is happening or cells are killed). In a single-celled organism, it will divide as much as possible unless negative exterior forces are acting upon it.

7 0

4 years ago