Question

Mendel described ratios of 1 dominant purebreeding: 2 hybrids: 1 recessive purebreeding, which we describe in modern genetic terms as a 1:2:1 genotype.

True

False

In Meiosis, chromosome pairs separate during _________________.

In Mendel's crossing scheme, which generation (s) include hybrids (heterozygotes)?

Group of answer choices

F1 and F2

P0 and F1

only the F2 generation

only the F1 generation

Answer 1

1. True. Mendel's monohybrid cross tells that when we cross two pureline parents, we get all hybrids in F1 and when we self cross the F1 generation, we get the F2 in the ratio 1:2:1 i.e. 1 dominant pureline : 2 hybrid : 1 recessive pureline.

2. Anaphase I. Explanation- In Anaphase I, homologous chromosomes separate and move to opposite poles. Separation of sister chromatids of chromosomes takes place in Anaphase II.

3. F1 and F2. Explanation- In mendel's crosses, if we cross to purelines then all the offsprings in F1 have hybrid/heterozygous genotype and in F2 generation, hybrids occur in different ratios.

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