Answer:
Option D
Explanation:
Options for the question
A) The Y chromosome is slower to mature than the X chromosome.
B) Replication of the X chromosome occurs more often in males.
C) Male hormones cause the expression of X-linked traits.
D) Males only have one copy of the X chromosome
Given-
Duchenne muscular dystrophy (DMD) is an X-linked recessive condition which means it will occur in male even if they have one diseased X gene. While females will have this disease only when they have two diseased X gene
Hence, in most of the cases women with only one diseased X chromosome act as carrier and show normal traits.
Let us assume X is normal gene and X' is the diseased gene then
Genotype of normal father will be - XY
Genotype of carrier mother will be - XX'
Now if these two mates, following offspring will be produced
XY * XX'
XX, XX', XY, X'Y
So the male with X'Y will have DMD
Hence, option D is correct
The answer is c because the numerical expression correction is 28
B and salt water with a density of 27 kg and M3
<span>The air that is found in soil is extremely different from the air that is found in the atmosphere. Why, you ask? Well, it's because the air that are in soils are not exactly exposed to moving air currents, thus the air that is found in soils are more moist and humid.
Good luck with your studies, I hope this helps~!</span>
Diffusions
Osmosis
Facilitated diffusion
Active transport
