How does crossing over mix up alleles from your paternal and maternal chromosome

Question

How does crossing over mix up alleles from your paternal and maternal chromosomesi O it causes alleles on the same chromosome to be inherited together o it involves a physical exchange of segments from homologous chramosomes. O It allows male and female gametes to combine randomly at fertilization. It causes alleles on nonhomologous chromosomes to be inherited independently. UESTION 5 If Mendel's dihybrid cross would have supported the theory of dependent assortment (rather than the theory of independent assortment, the phenotypic ratio of the crossin the Fz generation would have ben ? 9:3:31 ? 1:1 O 3:1

Explanation / Answer

Please find the answers below:

Answer 1: Choice 2 (crossing-over refers to physical exchange of segments of DNA on the sister chromatids of the chromosmoes in the homologous pairs, thus enhancing the variations)

Answer 2: Choice 3 ( If independent assortment did not take place in a dihybrid cross, the phenotype of the parents would be similar to those of parents only, hence ratio being 1:1 only)

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