The double-stranded DNA (Deoxyribonucleic acid) breaks into two separate strands when the temperature is increased, such as in the denaturation step of the PCR (Polymerase Chain Reaction), because the increase in the temperature makes the hydrogen bonds between the nitrogenous bases to break. The double hydrogen bond between the adenine and thymine, and the triple hydrogen bond between the guanine and cytosine breaks apart when heated causing the two DNA strands to fall apart.
Hence, the answer is the breaking of the hydrogen bond between the nitrogenous bases.
Answer:
Option A
Explanation:
Complete Question
Incontinetia pigmenti is an X-linked dominant condition. Homozygotes and hemizygotes die in utero. In infancy IP causes blistering of parts of the skin, and patchy altered pigmentation later. A woman with IP has a newborn child. What is the chance that newborn will be an unaffected girl?
a.
1/4
b.
1/3
c.
1/2
d.
2/3
e.
3/4
f.
Impossible to know without more information.
Solution
As we know that an X-linked dominant inheritance is a kind of genetic condition in which X linked mutant is a dominant trait. Thus, even if one copy of X chromosome is present, the offspring would be diseased individual.
Here , Given
Woman has ip, hence in order to have unaffected girl child she must mate a normal man
Genotype of woman would be XX'
Genotype of man would be YX
XX' * YX
XY, XX, X'Y. X'X
Two daughter and two son will be produce.
Out of the two daughters one is diseased and another one is normal.
Thus, the chance that newborn will be an unaffected girl is
Thus, option A is correct
<span>Advances and declining costs in sequencing technology will result in increasing number of studies with individual sequence data linked to phenotypic information, which has been dubbed medical sequencing. At least some of this linked information will be publicly available. Medical sequencing raises ethical issues for both individuals and populations, including data release and identifiability, adequacy of consent, reporting research results, stereotyping and stigmatization, inclusion and differential benefit and culturally and community-specific concerns. Those issues are reviewed, along with possible solutions to them.</span>
The first was that all organisms have descended with modification from common ancestors.
The second was that the major agent of modification is natural selection acting on variation between individuals.
Answer:
Microvilli are lined with blood vessels as well as lymphatic vessels.
Explanation:
The small intestine is one of the most important part of the body. This is the main site of digestion and absorption of food in the body. The three main parts of small intestine - dedenum, jejenum and ileum.
The small intestine has both villi and microvilli in its structure. These villi helps in increase in the surface area for absorption. Microvilli are lined with the blood vessels only and not with the lymphatic vessel. This vessels are directly connected to the hepatic portal system.
Thus, the correct answer is option (C).