NEET BIOLOGY

GENETICS AND EVOLUTION

INHERITANCE AND VARIATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Pure-breeding black-feathered chickens are mated with pure-breeding white-feathered chickens. All of the individuals in the offspring in the F1 generation have both black and white feathers. What will be the ratio of offspring phenotypes when two of the F1 generation chickens are crossed?
A
1 black:1 white
B
1 black:2 black and white:1 white
C
3 white:1 black
D
3 black:1 white
Explanation: 

Detailed explanation-1: -Then, when Mendel crossed two of the F1 progeny plants with each other (RrYy × RrYy), he obtained an F2 generation with a phenotypic ratio of 9:3:3:1, as summarized in Table 1.

Detailed explanation-2: -Enzymes are folded into complex 3D shapes that allow smaller molecules to fit into them. The place where these molecules fit is called the active site . In the lock and key hypothesis, the shape of the active site matches the shape of its substrate molecules. This makes enzymes highly specific.

Detailed explanation-3: -The mRNA travels out of the nucleus to a ribosome which is found in the cytoplasm. Here a process called Translation occurs in which the the amino acids are joined together in the correct order to make the protein.

Detailed explanation-4: -mRNA leaves the nucleus, moves into the cytoplasm and attaches to the ribosome. The ribosome is the organelle responsible for protein synthesis. tRNA molecules complementary to the mRNA arrive at the ribosome.

There is 1 question to complete.