You perform a test cross of the dihybrid AaBb and score the phenotypes of 1000 progeny. Assuming independent assortment, how man
y of the progeny do you expect to display the dominant phenotype for both the A and B genes?
1 answer:
Answer:
4
Explanation:
<em>The number of progeny expected to display the dominant phenotype for both the A and B genes should be 4.</em>
<u>A test cross usually involves crossing an individual whose zygosity is in doubt with an individual that is recessive for both alleles so as to ascertain the zygosity of the former.</u> Hence, for a test cross involving AaBb:
AaBb x aabb
Progeny:
4 AaBb
4 Aabb
4 aaBb
4 aabb
<em>Therefore, the number of progeny expected to display the dominant phenotype for both the A and B genes is 4.</em>
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Answer:
3. a leaf falling off of a tree to the ground.
Explanation:
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
Where;
- F represents force measured in Newton.
- m represents the mass of an object measured in kilograms.
- a represents acceleration measured in meters per seconds square.
Force can be categorized into two (2) main types; forces that at a distance and forces the act by direct contact with the body.
A force that acts at a distance refers to the force exerted on a body or an object without any physical contact between them such as gravitational force, magnetic force and electric force. This simply means that, there can be a push or pull between objects even when they are not in physical contact with each other due to gravitational, magnetic or electric forces.
<em>Some example of a force that acts at a distance is a leaf falling off of a tree to the ground, a magnet pulling an object to itself, a magnet pushing or repelling another magnet etc. </em>