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3 years ago

DNA samples should be stored in an airtight containers to prevent contamination true or false

Biology

1 answer:

Aleksandr-060686 [28]3 years ago

7 0

Answer: True

Explanation:

DNA is a biological evidence. It is a heredity material which is present in all organisms on earth. The DNA in humans can be taken as sample from nails, bones, blood, skin, hair and other sources.

The DNA samples can be taken so as to establish the identity of the culprit, victim or any one which is associated with crime.

The DNA evidence has applicability as a potent evidence in the court of law. Thus utmost care should be taken to preserve it's integrity until it is analysed and presented in the court of law.

Thus the DNA evidence should be collected and preserved in airtight containers so as to prevent the entry of airborne pathogens like bacteria, virus these can contaminate the sample evidence and can make the evidence not of any use.

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Assume that a black guinea pig crossed with an albino guinea pig produced 5 black offspring. when the albino was crossed with a

Radda [10]

As a matter of terminology, albino guinea pig actually refers to a white fur guinea pig, whose genotype is homozygous recessive (bb).

If it crossed with a black fur guinea pig and gave 5 black fur offsprings, there is a good chance that the black fur parent is homozygous dominant (BB).
The Punnett square would be as follows:

B B
b Bb Bb
b Bb Bb
So they are all heterozygous black fur offsprings.

However, it is not impossible that the black fur parent be heterozygous, namely

B b
b Bb bb
b Bb bb

Giving a 50% chance on each colour. Thus it is possible (with probability 1/32) that all five offsprings are heterozygous black fur if one of the parents was heterozygous.

In the second case, a homozygous recessive and a homozygous dominant parent will never give a white offspring. So it is sure that the black fur parent is heterozygous, with the following Punnett square:

B b
b Bb bb
b Bb bb

With a 50% probability for each of Bb (black fur) and bb (white fur).
the distribution 4,3 demonstrates this perfectly.

6 0

3 years ago

What is a eukaryote?

Arlecino [84]

Answer:

organisms that have a nucleus

Explanation:

eukaryotes have nucleus.

7 0

3 years ago

Read 2 more answers

How does the vertical temperature profile indicate whether the surface layer is well

gizmo_the_mogwai [7]

Explanation:

The depth is remaining constant in the surface layer, so that indicates the surface layer is. well mixed. C. The salinity is fairly constant in the surface layer, so that would indicate the layer is well. mixed

3 0

2 years ago

_____ is a common nutrition-related sign or symptom of early pregnancy that occurs in many healthy pregnant women. question 19 o

Alexus [3.1K]

The right option is fatigue

Fatigue is a feeling of tiredness, lack of energy and motivation. Fatigue is a symptom of iron-deficiency anemia, which is common in pregnancy. During pregnancy, hormonal changes such as increased progesterone levels, physical changes and emotional changes occur in the body and this can contribute to decreased energy resulting in fatigue.

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3 years ago

HELLPP! ITS BIOLOGY

larisa [96]

Answer:

So that in a guinea pig cross in the offspring the recessive trait —long hair— can be observed in 25%, the most probable genotype of the parents is heterozygous Ss.

Explanation:

In guinea pigs, for the characteristic hair length, short hair is the dominant allele and long hair is the recessive one.

In order for 25% of the offspring to express the recessive characteristic, the parents must have a recessive genotype, which can be seen in Punnett's Square:

P: Ss X Ss

Alleles S s

S SS Ss

s Ss ss

Where the offspring is:

50% Ss with short hair phenotype
25% SS with short hair phenotype
25% ss whose phenotype would be long hair.

According to this, heterozygous parents for the characteristic long hair in guinea pigs have a 25% chance of having offspring with long hair.

8 0

2 years ago