PATHOLOGY MCQ
GENETICS AND DISEASE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
dominance
|
|
|
true-breeding
|
|
|
a dihybrid cross
|
|
|
incomplete dominance
|
Detailed explanation-1: -Ans. Correct option: C. Dominance Because the heterozygote expresses the phenotype of the homozygous dominant (purple). About True-breeding : Homozygous dominant (purple) x Homozygous recessive (white…
Detailed explanation-2: -1) A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers.
Detailed explanation-3: -The F1 generation is 100% Pp. The F2 generation is 25% PP (homozygous dominant, purple flowers), 50% Pp (heterozygous, purple flowers), and 25% pp (homozygous recessive, white flowers). This is how the white characteristic reappears in the second generation. The phenotype is 3:1, purple to white.
Detailed explanation-4: -If pure purple flowered plants are crossed with white flowered plants, all plants of F1 generation are heterozygous purple flowered plants.
Detailed explanation-5: -Answer and Explanation: In this situation, every offspring produced from this cross with be a heterozygote (Pp), and because purple is dominant to white, all the offspring will be purple. Therefore, the probability of an offspring having white flowers is zero.