AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A heterozygous round seeded plant (Rr) is crossed with a homozygous dominant round seeded plant (RR). What percentage of the offspring will be homozygous dominant?
A
100%
B
75%
C
50%
D
25%
Explanation: 

Detailed explanation-1: -Thus 50% of the offsprings will be homozygous round seeded whereas 50% will be heterozygous round seeded plants.

Detailed explanation-2: -The selfing of F1 will give F2 generation, where there will be one homozygous dominant round seed plant (RR), two heterozygous round seed plants (Rr) and 1 homozygous recessive wrinkled seed plant (rr). Phenotypically, there will be 3 round seed plants and 1 wrinkled seed plant. Hence, the correct answer is ‘3:1’.

Detailed explanation-3: -In the F1 generation, 50% of the offspring produced wrinkled seeds.

Detailed explanation-4: -So, the correct option is ‘303 rounded: 301 wrinkled’.

Detailed explanation-5: -When a heterozygous round seeded plant is crossed with a recessive wrinkle seeded plant, the round and wrinkled phenotypes will appear in F, in the ratio.

There is 1 question to complete.