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
Answer:
Small, nonpolar molecules (ex: oxygen and carbon dioxide) can pass through the lipid bilayer and do so by squeezing through the phospholipid bilayers. They don't need proteins for transport and can diffuse across quickly.
Explanation:
The channel proteins act like doors through the cell membrane.
They allow large polar molecules to move in and out of the cell.
The process is called passive diffusion or passive transport, because it does not need energy.
Sometimes the protein changes shape to help the polar molecules move through the channel.
It often uses a gated pore mechanism, in which the channel is never completely open.
Fungi are responsible for what common human ailment athlete's foot infections
It is the third option. Reason being is because the first one describes what they do when danger approaches and it doesn't say anything about moving. The second one describes what they do to protect their young from the harsh environment around them; no movements mentioned. The fourth one just says what a penguin does but they can be standing when they do it; no mention of any movements at all.
Hope this helps!! :)