
1) Amphimixis 2) Fungi reproduction 3) Sexual reproduction 
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https://www.crosswordclues.com/clue/isogamy

 Isogamy is a form of sexual reproduction that involves gametes of similar morphology (similar shape and size), differing only in allele expression in one or more mating-type regions. Because both gametes look alike, they cannot be classified as `male` or `female.` Instead, organisms undergoing isogamy are said to have different mating types, m...
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http://en.wikipedia.org/wiki/Isogamy

The condition in which gametes are morphologically similar, as in the members of the Zygomycotina. 920) 
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http://ppathw3.cals.cornell.edu/glossary/Defs_I.htm

(from the article `gamete`) ...organism (i.e., haploid). During fertilization, male and female gametes fuse, producing a diploid (i.e., containing paired chromosomes) zygote. ... ...each parent). Gametes may be motile, by means of whiplike hairs (flagella) or of flowing cytoplasm (amoeboid motion). In their union, gametes may ... [2 ...
Found on 
http://www.britannica.com/eb/a-z/i/44

<biology> A condition where the gametes of a species are equal in size. Generally this means that there is only one type of gamete with no sexual difference. ... (15 Oct 1997) ... 
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http://www.encyclo.co.uk/local/20973

(i-sog´ә-me) reproduction resulting from union of two gametes identical in size and structure, as in protozoa. adj., isog´amous., adj.
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http://www.encyclo.co.uk/local/21001

The condition in which gametes are morphologically similar, as in the members of the subclass Zygomycetes of the class Phycomycetes.
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http://www.encyclo.co.uk/visitor-contributions.php

Type: Term Pronunciation: ī-sog′ă-mē Definitions: 1. Conjugation between two equal gametes or two individual cells alike in all respects.
Found on 
http://www.medilexicon.com/medicaldictionary.php?t=45884

[
n] - (biology) reproduction by the union or fusion of games of the same size and structure
Found on 
http://www.webdictionary.co.uk/definition.php?query=isogamy

isogamy, isogamous 1. The fusion of isogametes in some algae and fungi during reproduction. An isogamete is a gamete that is physically identical to another with which it unites to form a zygote. 2. The union of two equal and similar gametes or cells in reproduction, as in conjugation. Among animals the male gametes are known as spermatozoa and the...
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http://www.wordinfo.info/words/index/info/view_unit/2788/3

the fusion of two gametes of similar form, as in certain algae.
Found on 
https://www.infoplease.com/dictionary/isogamy
  No exact match found.