CELL DIVISION
MEIOSIS AND GENETIC VARIATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
100% tall
|
|
|
75% tall, 25%short
|
|
|
50% tall, 50%short
|
|
|
25% tall, 75% short
|
Detailed explanation-1: -As shown in the figure a cross between two heterozygous tall plants results in 25% homozygous tall, 50% heterozygous tall and 25% dwarf plants. Thus the correct answer is option C.
Detailed explanation-2: -So, the correct option is ‘50%’.
Detailed explanation-3: -Answer and Explanation: A heterozygous tall plant will have a genotype of Tt. T is mainly the dominant allele and will actually rule over the t allele, which is recessive. Therefore, due to the presence of the T allele, the plant will show a tall phenotype.
Detailed explanation-4: -In a cross between heterozygous tall plants (Tt) and a homozygous dwarf plant (tt), the ratio in the offspring shall be 1 tall : 1 dwarf. This is because the heterozygous plant will make two types of gametes, one type having T allele and the other having t allele. Hence, the correct answer is ‘1 tall : 1 dwarf’