Principle of Inheritance and VariationEasyBloom L4

Question

Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring analysed. Which of the following statements about this situation is true?

Options

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 produced by the offspring will carry only one allele for this gene.
D.All of the above

Solution

Sol.(d) [Key Concept: True-Breeding Crosses — All Statements True] All three statements are correct when true-breeding organisms are mated: (a) True-breeding = homozygous (AA or aa), so both parents are homozygotes; (b) Cross could be AA×AA → all AA (homozygotes), or AA×aa → all Aa (heterozygotes), or aa×aa → all aa (homozygotes); (c) F1 offspring (whether AA, Aa, or aa) produce gametes carrying only one allele per gene (A or a) following segregation. All of the above (d) is correct.

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