Question

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring were analysed. Which of the following statements about this situation is correct?
(A) Both parents are homozygotes.
(B) The offspring are either all homozygotes or all heterozygotes.
(C) The offspring represent the F1 generation and the gametes produces by the offspring will carry only one allele for this gene.
(D) All of the above

Answer 1

Hint: Plants that have been produced by repeated self-pollination and have developed homozygosity for a certain characteristic are considered to be true breeding lines. If bred with another true breeding plant, this feature is then transmitted down to the following generations.

Complete Step by Step Answer:
In the above question it is mentioned that both the parents are true breeding that is the cross must be AA x AA, AA x aa, aa x aa.
So, if parents are AA x AA then all the offsprings will be AA; if parents are AA x aa then all the offsprings will be Aa, if parents are aa x aa then all the offsprings will be aa – all these offsprings represent F1 generation. So, option (C) is correct. Also the offsprings can be either AA, Aa or aa that is offsprings can be either homozygous or heterozygous. So, option (B) is also correct. As mentioned above that genotypes of parents are true breeding so parents must be homozygous. So, option (A) is also correct.

The cross must be either AA AA, AA aa, or aa aa since both parents are true-breeding. If you solve these crosses, you will discover that every potential solution holds true in every scenario.
Therefore all the above options are correct.

So, option (D) is correct answer.

Note: Mendel was the first to notice true breeding lines, which may be used to study the genetics and inheritance patterns of plants by choosing different features and pollinating them over numerous generations.