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1 Department of Zoology, Columbia University, New York City
The development of androgenetic R. pipiens and R. palustris embryos has been briefly described. A detailed study of their androgenetic hybrids has been made.
The (pip) pal embryos develop uniformly to an early neural fold stage, then differentiation ceases, the neural plate cells are sloughed off and the embryos die.
The (pal) pip embryos develop uniformly until early gastrulae. Thereafter their development is highly variable. Gastrulation is usually incomplete, and a short neural plate may be formed. In a few embryos closure of the neural folds niav occur and neuroid and neural tissue be formed. An occasional embryo is capable of slightly further differentiation, with an abnormal brain and neural tube, and optic and otic vesicles.
The effects of haploidy and the results obtained by combining a haploid set of chromosomes of one species with the cytoplasm of a different species are discussed.
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