Answer:
1.
Explanation:
Atomic mass is protons+neutrons. Atomic number is just protons.
Answer:
Option-D
Explanation:
In the given question the genotype of parental allele is- AbaB X AbaB. The alleles formed will be- AB, Ab,aB, ab in which the crossover allele will be AB and ab.
1. Unlinked genes
Now of these alleles are unlinked then the alleles will assort independently of each other therefore performing the punnett square we will get dihybrid ratio as 9:3:3:1 in which
1. A_B_ are 9
2. aaB_ are 3
3. A_bb are-3
4. aabb- 1
Since the crossover allele are AB and ab therefore A_B_ are 9 and aabb- 1 represent recombinant genotype.
2. Linked genes
When the genes will be linked then chances of crossing over will be reduced as a result of which only two type of allele will be formed which are- Ab and aB and the recombinant frequency will become less.
Crossing these allele will form Aabb
, AaBb
, AaBb and aaBB genotypes.
The recombinant ratio will decrease as A_B_ is 2 and aabb is not present.
Thus, option-4 which states that the unlinked ration is 9:3:3:1 and linked ratio is <9: >3: >3: <1 is correct.
They are also called "Land Plants" that are non-vascular!
Hope this helps!
D. Loss of the upward force opposing gravity
Explanation:
A hanging apple from a tree branch will fall when it loses the upward force opposing gravity. The force of gravity is directed towards the center of the earth and it pushes all bodies downward.
On the apple, the forces acting on it are:
- downward force of gravity
- Upward force holding it by the fruit stalk.
According to Newton's first law "a body will remain in it's state of rest or uniform motion unless an external force acts on it "
The apple is initially at rest when the force of gravity equals the upward force :
Force of gravity = Upward force
The two forces acts in opposite direction and cancel out.
When the downward force is lost by stalk holding the fruit, gravity wins and the fruit falls;
Force of gravity - Upward force = Net force = falling of the fruit
In case we push up the fruit, the upward force overcomes and it moves upward:
Learn more:
Newton's laws brainly.com/question/11411375
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