GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
100% green
|
|
|
100% yellow
|
|
|
3:1 (3 green, 1 yellow)
|
|
|
1:2:1
|
Detailed explanation-1: -The genotypic ratio is 1: 2: 1 (YY-1, Yy-2 and yy-1).
Detailed explanation-2: -The cross between heterozygous yellow seeded plant and green seeded plant will produce 50% yellow seeded plants and 50% green seeded plants. Hence, option A is the correct answer.
Detailed explanation-3: -When two heterozygous plants are crossed, the resulting progeny mostly show the dominant phenotype. But, the recessive phenotype reappears.
Detailed explanation-4: -When counting all four possible outcomes, there is a 3 in 4 probability of offspring having the yellow phenotype and a 1 in 4 probability of offspring having the green phenotype. This explains why the results of Mendel’s F2 generation occurred in a 3:1 phenotypic ratio.