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Slav-nsk [51]
3 years ago
11

During which phase of meiosis do synapsis and crossing over occur

Biology
1 answer:
FrozenT [24]3 years ago
5 0
It allows matching-up of homologous pairs prior to their segregation, and possible chromosomal crossover between them.
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If slim shelled snails have dainty shelled posterity and thick shelled snails have thick-shelled posterity then this is a decent proof that shell thickness is heritable.  

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D is ruled out because if the child only received one recessive allele but her other allele is dominant, then the most she could be is a carrier. Dominant over recessive.

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